Honda-SOHC

SOHC.co.uk Forums => Project Board => Topic started by: onethumb on September 03, 2016, 10:49:25 PM

Title: My cb750 scrambler build. Restart
Post by: onethumb on September 03, 2016, 10:49:25 PM: Thought I'd share my build with those who might be interested. I'll post more pics over the next week. This is how I bought it(http://uploads.tapatalk-cdn.com/20160903/f8633d558c5a2f0309b3266261d13d71.jpg). (http://uploads.tapatalk-cdn.com/20160903/3d4b0c151db0c72774a48bd08295a1cb.jpg)

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Title: Re: My cb750 scrambler build.
Post by: onethumb on September 03, 2016, 10:51:21 PM: The next day (http://uploads.tapatalk-cdn.com/20160903/6025ee15bb980d0a396a1022d812e20e.jpg)(http://uploads.tapatalk-cdn.com/20160903/4dc67271360b54f70b02c6826951ee75.jpg)

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Title: Re: My cb750 scrambler build.
Post by: onethumb on September 03, 2016, 10:53:09 PM: Next engine out with great info from the forum.

(http://uploads.tapatalk-cdn.com/20160903/1d62770ec5c505272ed7d40bdbc7f09e.jpg)

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Title: Re: My cb750 scrambler build.
Post by: onethumb on September 03, 2016, 10:54:55 PM: Rebuild carbs(http://uploads.tapatalk-cdn.com/20160903/14d95cb0ded87b3265cd417fdedf5df0.jpg)(http://uploads.tapatalk-cdn.com/20160903/caa26b08012c0a63feb55cb9a8db4e2f.jpg)

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Title: Re: My cb750 scrambler build.
Post by: onethumb on September 03, 2016, 10:56:57 PM: Start frame(http://uploads.tapatalk-cdn.com/20160903/867a8be92f457b072e8e5abc39c1adf0.jpg)(http://uploads.tapatalk-cdn.com/20160903/09875d39b6c9220cc631a9eca43c0c1c.jpg)

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Title: Re: My cb750 scrambler build.
Post by: onethumb on September 03, 2016, 11:00:23 PM: idea starts (http://uploads.tapatalk-cdn.com/20160903/63b045e6d082c333d8d0e33cc04b3e7e.jpg)

(http://uploads.tapatalk-cdn.com/20160903/f44307b95ee1879cc071199dd9e39028.jpg)

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Title: Re: My cb750 scrambler build.
Post by: yozzer74 on September 05, 2016, 02:38:44 PM: Here's a Suzuki Gs done in scrambler style . Looks well
Title: Re: My cb750 scrambler build.
Post by: onethumb on September 05, 2016, 09:33:12 PM: Thanks yozzer That's a nice look. I'm going for the same kinda thing.

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Title: Re: My cb750 scrambler build.
Post by: yozzer74 on September 06, 2016, 09:16:51 AM: I've got a old Gs550.I'm going to do like that
Title: Re: My cb750 scrambler build.
Post by: onethumb on September 06, 2016, 09:22:04 AM: Buddy if it's anything like the CB cafe racer you did it will be a bit special.
I look forward to its build.
Will you put the pics are up here or will we have to go to the dark side?

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Title: Re: My cb750 scrambler build.
Post by: yozzer74 on September 06, 2016, 09:23:55 AM: Dark side .probably on do the ton forum have you been on there
Title: Re: My cb750 scrambler build.
Post by: onethumb on September 06, 2016, 09:29:04 AM: Not yet but I'll make sure to check it out later today.

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Title: Re: My cb750 scrambler build.
Post by: onethumb on September 06, 2016, 09:33:48 AM: (http://uploads.tapatalk-cdn.com/20160906/0858a7e2fb825093268bc8419c795c28.jpg)(http://uploads.tapatalk-cdn.com/20160906/90871415e227eec3c76593306735ad73.jpg)
This was my idea for the seat unit so I could keep the original tank. I used 3mm aluminium for the base the 1.5mm aluminium for the hump as it was easy to bend.

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Title: Re: My cb750 scrambler build.
Post by: onethumb on September 06, 2016, 09:39:36 AM: I then tried to duraweld them but the 1.5mm melted so it was scrapped. So next. I used 3mm aluminium for the hump. This took a bit of bending. (http://uploads.tapatalk-cdn.com/20160906/85c4ec8ccf5bbff1c55ecd352b123692.jpg) . (http://uploads.tapatalk-cdn.com/20160906/6ff01da660067845b9cd9282f6053507.jpg)

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Title: Re: My cb750 scrambler build.
Post by: onethumb on September 11, 2016, 12:17:17 AM: Today I've fabricated an under seat storage space for the m-unit to be positioned and to tidy up the underneath.
(http://uploads.tapatalk-cdn.com/20160910/135dc608ee85c339313d65635baf20af.jpg)(http://uploads.tapatalk-cdn.com/20160910/6634798946c791e1b34f04c74ae13a2a.jpg)
Title: Re: My cb750 scrambler build.
Post by: onethumb on September 11, 2016, 12:20:16 AM: I made it using 1mm steel but had to make it in three sections due to the shape of the frame and the tube diameters.
(http://uploads.tapatalk-cdn.com/20160910/d2aefbfb422c0492a83cb81564c30f0a.jpg)(http://uploads.tapatalk-cdn.com/20160910/80900920774167dca1b792017e64e69a.jpg)

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Title: Re: My cb750 scrambler build.
Post by: onethumb on September 11, 2016, 12:23:00 AM: Added some holes for the cables to be routed and now it's ready to go to the powder coaters next week.
(http://uploads.tapatalk-cdn.com/20160910/04daec1291af781b4345d038803444a7.jpg)

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Title: Re: My cb750 scrambler build.
Post by: yozzer74 on September 11, 2016, 01:24:53 AM: You really need to make sure there's enough clearance for the wheel under there .have you taken springs off your shockers and lowered it down to the bump stops .that's how I checked mine for clearance .
Title: Re: My cb750 scrambler build.
Post by: royhall on September 11, 2016, 01:51:15 AM: I don't have much to add except it's looking mighty impressive. Keep up the good work.
Title: Re: My cb750 scrambler build.
Post by: onethumb on September 11, 2016, 08:48:57 AM: Thanks roy appreciate the feedback. Good or bad, especially when building a one off.

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Title: Re: My cb750 scrambler build.
Post by: onethumb on September 11, 2016, 08:51:37 AM: Yozzer thanks for the heads up, guess what I'm doing today on the frame?

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Title: Re: My cb750 scrambler build.
Post by: onethumb on September 13, 2016, 09:18:50 PM: Right then folks, first off thanks to all the input I had over the the tyre catching. What a balls up that was.
After reading this site and the US sister site I'm going to be using 365mm shocks from the cb750 dohc to give me the look I'm after and give me a extra 30mm (people have said its a good swap)
So with that in mind I've marked the frame and then built this plate for the m-unit.
I've not welded it in yet as I thought I'd post the pictures so you could all have a look and let me know if I've missed anything or forgot something.
Thanks waiting in anticipation. (http://uploads.tapatalk-cdn.com/20160913/4a05ced7f9510142ae73b8a4147f078d.jpg)(http://uploads.tapatalk-cdn.com/20160913/5529f31b8bb83ea2ab05f1a3ae236be9.jpg)(http://uploads.tapatalk-cdn.com/20160913/3a0d054a8eaf7d29482538b5725c6747.jpg)(http://uploads.tapatalk-cdn.com/20160913/0e006c8f5f56ec33c7bf576d297350ff.jpg)(http://uploads.tapatalk-cdn.com/20160913/0aff2332dfbfc3decf0a8102cf14d481.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: Nurse Julie on September 13, 2016, 09:30:23 PM: Looking good. The only problem I can foresee is that there is no way that tumble dryer will fit under the seat ;D ;D ;D
Joking aside, good luck with this version of the build, makes sense to start again and get it right.
Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on September 14, 2016, 04:42:09 AM: How are you going to route your wires there and make it all look tidy .
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on September 14, 2016, 07:29:35 AM: Hi nurse Julie, the dryer is going in the sidecar I'm making next year. I had the foresight to think of that. Thanks though

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on September 14, 2016, 07:32:55 AM: Yozzer!!! Ahhhhhh!!! Ok back to the drawing board for some modifications, or a change of direction.

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on September 14, 2016, 12:58:13 PM: Pmsl sorry Onethumb it's a headache.when we were doing mine .I would come up with a idea think it was great then realize it affected something eles .so back to drawing board .but I did have help off Paul at one off welding .
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on September 14, 2016, 03:58:38 PM: Well I seem to have the help of you and others on this forum

With the m-unit I'm also using the m-button so I won't have that many wires running up the frame, think I might run a plate across the front to hide some of the wires from sight. I was also thinking of running some of the wires inside copper pipe where and if possible making a feature out of it. I've loads of ideas but as already been proved that means nothing.

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on October 11, 2016, 09:29:42 PM: Hi again. I've changed the plan and I've welded a bracket on to the back loop for the stop and tail light and number plate bracket. I've also welded a plate onto the inside of the loop for the seat unit.
Used my compressor and a bag of kiln dried sand and sand blasted the frame so its off to the powder coaters tomorrow.
Regarding the the m-unit I've made a bracket to fit over the battery carrier.
I know I've forgotten something but I'll cross that bridge when I get to it. (http://uploads.tapatalk-cdn.com/20161011/8768a5b899b648e08e55f890f41bcbf0.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: UK Pete on October 12, 2016, 09:20:46 AM: Thats looking like a fun project, when you find solutions to problems it is so rewarding, i just love a good project
pete
Title: My cb750 scrambler build. Restart
Post by: onethumb on October 12, 2016, 04:43:19 PM: Thanks Pete, it's been a learning curve but it means the next one should be a little easier. How's yours going?

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on October 21, 2016, 09:52:14 PM: Well yozzer it's too late now. I've had the frame, swing arm and footrest hangers powder coated. Collected them today from Craig at parkfield electroplating in Wolverhampton they've done a top job and it was only £75. (http://uploads.tapatalk-cdn.com/20161021/e1f731b5b11010a48aaf1afd2b04f857.jpg)(http://uploads.tapatalk-cdn.com/20161021/00768507076a3808d7960bbedd655b25.jpg)
Going to rebuild the swingarm over the weekend, bushes have been put to soak in oil. Now just need to remember how the heck it all goes back together.

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on October 21, 2016, 10:31:20 PM: What you doing with wheel's
Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on October 21, 2016, 10:32:11 PM: And tyres
Title: Re: My cb750 scrambler build. Restart
Post by: Pops400 on October 21, 2016, 10:33:44 PM: Looked good in the flesh, too. Good to meet you today, Buddy. Given me some more ideas too.
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on October 21, 2016, 10:34:24 PM: Hi buddy, I've sand blasted them and sprayed them Matt black. Don't know what shoes to put on them yet. Ideas?

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on October 21, 2016, 10:38:31 PM: Cheers pop. Hope that grinder serves you well. I'll be looking at your feed and seeing the new vigour thats going to put into the strip down.

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on October 27, 2016, 10:07:41 PM: Small update. All wrapped up. Seat unit is going to the upholsterer on Tuesday need to decide between flutes or diamond stitching, any thoughts?(http://uploads.tapatalk-cdn.com/20161027/9091fc40d591b29d5c3fc9a6775ff2ce.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on October 29, 2016, 01:10:17 PM: I'm thinking of putting these bad boys on the old girl. (http://uploads.tapatalk-cdn.com/20161029/123d61037a9a7177e87d240b993d74f4.png)

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Title: Re: My cb750 scrambler build. Restart
Post by: Pops400 on October 29, 2016, 01:40:39 PM: Flutes for me, but a personal choice, that one. Neither is a bad call.
Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on October 29, 2016, 06:32:21 PM: What size do they do them in
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on October 29, 2016, 06:51:25 PM: Do yo like the look of them buddy?
I've been advised to go for 100/90/19 front and 110/80/18 rears but they do a 120/90/18 but I'll be tight on the clearance. They are a tubed tyre though.
Yozzer if you've got 5 can you check if you're wheels are stamped tt for tube type or tl for tubeless. I'm down in London this weekend and I know I've the same wheels as you.

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on October 29, 2016, 09:40:33 PM: I've got tubes in mine I'm wanting something like those for my Gs build how much are they
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on October 29, 2016, 10:12:31 PM: From £150 supply only. Been quoted £200 including tubes and fitting from a local garage in wolves.
Not the cheapest but they've got a great rep in the wet and dry.
Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on October 29, 2016, 11:57:33 PM: What's the name of them
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on October 30, 2016, 09:07:05 AM: Conti tkc 80.

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 04, 2016, 06:17:00 PM: Well engine is in and the rebuilding has started. (http://uploads.tapatalk-cdn.com/20161104/3d1d252c0e2acb8fc69f2923d28d58a9.jpg)(http://uploads.tapatalk-cdn.com/20161104/ff07b7a72313c954e4b34289db832167.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: MarkCR750 on November 04, 2016, 07:11:07 PM: I like the look of the engine, matt black and stainless, great contrast .
Title: Re: My cb750 scrambler build. Restart
Post by: Pops400 on November 04, 2016, 07:21:55 PM: Agreed. Looking good, Steve.
Title: Re: My cb750 scrambler build. Restart
Post by: mike the bike on November 04, 2016, 07:52:34 PM: I like that too.
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 04, 2016, 09:37:09 PM: Thanks guys. I've sourced all the bolts via eBay and local fastener company's, took a bloody while and found out today that I've missed one! The wheels are at the tyre place I've done them the same, matt black with the stainless nuts and bolts, so here's hoping it looks ok.

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on November 04, 2016, 11:43:56 PM: Nice work what paint did you use on engine
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 05, 2016, 09:35:53 AM: Hi yozzer, it was Rust-Oleum Stove and BBQ Heat Proof Black paint, on the recommendation of members on this and the USA site. Went on a piece of cake.

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on November 05, 2016, 01:19:24 PM: What's next job then have you bought the m unit yet
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 05, 2016, 01:56:32 PM: Off to Valencia for the last round of the GP on Wednesday so can't order anything till I get back so the m-unit is on hold till then.
Looked through my box of parts and I'd forgot the headstock bearings so that's the next thing along with the new tyres so I can move it around my very small garage.
How's your scrambler build?
The cafe racer looks the bizz.

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 07, 2016, 07:05:34 PM: Got my tyres! Shame I can't put the front on as I'm still waiting for my order from ds for my headstock bearings.
(http://uploads.tapatalk-cdn.com/20161107/2cd1c731df5489c6d0a6a88f3286730a.jpg)(http://uploads.tapatalk-cdn.com/20161107/65d1cadb285d4ba04fed21b8c40c8510.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: Alex jb on November 07, 2016, 07:55:02 PM: The treads look great, did you get the longer shocks? The clearance looks reasonable.

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on November 07, 2016, 08:02:59 PM: Looking good and the clearance does look good too
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 07, 2016, 08:22:21 PM: Thanks for the comments. Hi Alex I did go for the longer shocks, they are 365mm from cb750 DOHC so 30mm longer than the SOHC shocks. This was what a lot of people in the states said to go for. I'm really pleased with the look of the tyres just what I was after. Worth the extra £££s.
Yozzer, you'll be gad to hear I've now got 120mm from the top of the tyre to the lowest point on the frame so ripping all the metalwork out, changing the design and fitting the longer shocks has worked out. Thanks for the heads up about checking the clearance because I had completely missed it.

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on November 07, 2016, 09:09:37 PM: Think you will have to set your chain a little slack with having longer shocks on .I've been reading about it
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 07, 2016, 09:18:50 PM: The tyre guy said the same. Don't know if to buy a new chain with a couple of extra links or go with the original and see how much slack I can get with it. Can you tell me where to look for some extra reading?

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on November 07, 2016, 09:21:03 PM: http://www.dotheton.com/forum/index.php?topic=70280.msg824432#msg824432
Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on November 07, 2016, 09:22:09 PM: Read this thread it's quite good and on same lines as yours
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 07, 2016, 09:24:57 PM: Thanks buddy.

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Title: Re: My cb750 scrambler build. Restart
Post by: K2-K6 on November 07, 2016, 09:34:23 PM: To set the chain tension, remove shocks, pack wheel up until the centre of both sprockets and the swing arm pivot are all in one line as close as possible then tension chain to give just a small amount of slack (about 10mm) and tighten wheel.
Then put shocks back on, and measure the slack in the chain to give you an in use set point for future adjustment.

If you set it too tight with the swinging arm extended downwards then as you ride it, when the suspension compresses it will go to tight at its longest point and pull the hell out of the bearings, particularly the gearbox output one.

Build looks good by the way.

Tires look good, I've used them on lighter bikes (kdx250) on the road and they are pretty good but squirm quite alot with front brake use so may take a bit of care to get the feel of them if you've not ridden with them before especially with the weight you'll be carrying on this bike.
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 07, 2016, 09:59:59 PM: K2-K6 thanks for the kind words and the information. Just read the link Yozzer put up and it says the same, yours is a little easier for a first timer like me to follow.
I'm hoping that riding my 1998 XR250 on the road with mud tyres on will be good practice.

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Title: Re: My cb750 scrambler build. Restart
Post by: K2-K6 on November 07, 2016, 10:51:29 PM: Oops, I didn't see Yozzer's link, apologies for that. It's good to get it setup right though to avoid any problems.

As you've got there with the xr you get to make a bit of allowance for them as they aren't so precise as a road tire. Be interesting to see what you think of them on this bike when you've got it going.

Are you just going to ride it on the road or something a bit more adventurous with it?
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 07, 2016, 11:03:24 PM: It's for the road, maybe a trip to the beach and it might go on the grass when I park it at a show or something but the build was all about the bringing back an unloved bike that had been in a shed since 1998 and giving it a new lease of life. And in process teaching me a few things as well.
Thanks for the heads up about the tyres though, the bloke at the tyre shop said he'd had a lot of good feedback from these but this was the heaviest bike he'd heard of them being fitted too. Still nothing ventured nothing gained.

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 16, 2016, 09:51:44 PM: Right then the fronts built up with the scrambler bars. I think I like them. (http://uploads.tapatalk-cdn.com/20161116/acb4435dd760706a971a31af92d811e8.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on November 17, 2016, 07:12:23 AM: It's coming on looking good
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 18, 2016, 05:13:12 PM: Cheers dude. Just got my seat back. I'm proper pleased.

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on November 18, 2016, 05:42:03 PM: Pics then??
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 18, 2016, 05:51:00 PM: Sorry. Here you go. (http://uploads.tapatalk-cdn.com/20161118/7508568b66f31e60e307c0052fbf64d9.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on November 18, 2016, 06:03:56 PM: Pmsl looks nice that did you have it made
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 18, 2016, 06:09:56 PM: Thanks dude. I made the base then had it covered professionally by a chap in Buckinghamshire, AJ trimmings. He's done it in leather for me. The flutes are at 1" 1/2 spacing all finished in black stitching.

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Title: Re: My cb750 scrambler build. Restart
Post by: Pops400 on November 18, 2016, 06:54:26 PM: Like that.
Title: Re: My cb750 scrambler build. Restart
Post by: Nurse Julie on November 19, 2016, 05:40:08 PM: Quote from: onethumb on November 18, 2016, 05:51:00 PM
Sorry. Here you go. (http://uploads.tapatalk-cdn.com/20161118/7508568b66f31e60e307c0052fbf64d9.jpg)

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The seat looks great. I also like the bracket on the back of the hoop, is that for a tail light and number plate and will there be enough clearance between the bottom of the number plate and the wheel?. I'm asking because I'm trying to work out how to attach the light / number plate to the hoop on my 550 project.
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 19, 2016, 05:58:23 PM: Hi Julie. Thanks for the kind words. Well spotted, that's exactly what's it's for. I've had to bend the number plate bracket slightly upwards to get clearance but haven't tried it since I got the wheels on. I'll have a look tomorrow and see if I can put it on loosely and post a pick or two.
The bracket came about from that whole episode where I had to scrap all my other ideas due to tyre clearance. It's funny how these things sometimes turn out for the better.

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Title: Re: My cb750 scrambler build. Restart
Post by: Underdog1 on November 20, 2016, 10:39:03 AM: Quote from: onethumb on November 18, 2016, 06:09:56 PM
Thanks dude. I made the base then had it covered professionally by a chap in Buckinghamshire, AJ trimmings. He's done it in leather for me. The flutes are at 1" 1/2 spacing all finished in black stitching.

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What type of foam did you use for the seat base mate? Need to make one up at some point and yours seems very good for a semi home job
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 20, 2016, 01:51:39 PM: Underdog1 the base is 3mm aluminium base plate then 2x1" upholstery foam which me and the upholstery guy fitted and shaped while I was there with the tank on the frame so we could see all the lines then when we were happy I left him to cover it.
It's the really dense foam that's made up off the off cuts then pressed an glued. Sorry don't know what it's called.

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 20, 2016, 08:32:49 PM: Here you go nurse Julie. Hope this helps. (http://uploads.tapatalk-cdn.com/20161120/3b47191b7c39b6999fb591bedfc57def.jpg)(http://uploads.tapatalk-cdn.com/20161120/df7a9b10200a70d98c724d4c2cac03d7.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: Nurse Julie on November 20, 2016, 09:20:22 PM: Thanks for pic Steve. Yes, the plate and light fit on the hoop nicely. Difficult to tell properly from the photo but is the angle of the plate legal?. Now, don't get me wrong, I don't mind breaking the law but would be interesting to know if it would pass MOT rules.
Title: Re: My cb750 scrambler build. Restart
Post by: Alex jb on November 20, 2016, 10:02:50 PM: Mine passed like this...
(http://uploads.tapatalk-cdn.com/20161120/47c78713591015ac334d3f25ac9366f2.jpg)

But my bike is also tiny!

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 20, 2016, 10:35:53 PM: Nice bike Alex. Carpet in the garage. How posh. I've just got concrete and cardboard. ( that's not an invitation for the "you were lucky" monty python sketch to start)
I can always bend it down a bit if needed. (Not an innuendo)

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Title: Re: My cb750 scrambler build. Restart
Post by: Alex jb on November 20, 2016, 11:02:05 PM: Thanks :)
If only the garage door held any bloody heat in it would be alright in there!
The bike tucks away on the left and my treadmill and turbo trainer fit behind, it's the home gym too!

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 21, 2016, 12:12:20 AM: To all those who've done a big 750 before what's the easiest order to go about the rebuilding from where I am now?
Here's the last picture.
Thanks.
(http://uploads.tapatalk-cdn.com/20161121/27a2655c1e63d3bf7c5c351de573938b.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: Green1 on November 21, 2016, 08:43:18 AM: I would go carbs as there easy to get too at the moment then wiringloom and coils next
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 21, 2016, 10:10:17 PM: Cheers green1 it's what I was thinking but I've made that many mistakes so far that I thought I'd ask first.

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Title: Re: My cb750 scrambler build. Restart
Post by: Green1 on November 21, 2016, 10:13:33 PM: You won't know its wright if you don't get it wrong. ;)

Mick
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 22, 2016, 08:06:43 PM: Just popped the carbs in, and I do mean popped. Took me about 20 minutes in the end soaked the rubbers in boiling water and left for about 10 minutes. Thought I'd got them in a couple of times till I looked with the torch, then pop in they went, you do know when they're seated!

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 22, 2016, 08:34:50 PM: (http://uploads.tapatalk-cdn.com/20161122/1f460b53c59c8809de266cf000c09087.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on November 23, 2016, 07:08:06 PM: Have you got your m unit yet .
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 23, 2016, 09:35:54 PM: Not yet dude order is going in next week. Getting the m-button as well.
Did you go for a solid state regulator, if so which one and where from?

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on November 23, 2016, 10:42:11 PM: Yes on the rr got it from m&p .my mates just bought the m unit & m button got it from digital speedos .best price I've seen on them .
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on November 23, 2016, 11:08:49 PM: Yep that's where I'm getting mine from. Thanks.

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 04, 2016, 04:20:16 PM: It's here!!!!(http://uploads.tapatalk-cdn.com/20161204/b3dc3c9eb36a619442671c8ffaf28629.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on December 04, 2016, 09:59:00 PM: Now the head scratching starts ;D
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 04, 2016, 10:04:36 PM: Dude, tell me about it. Apparently Excitement and fear are exactly the same the only thing that changes is your choice of which one you call it!
I don't know which one it is yet.

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 04, 2016, 10:07:41 PM: Still waiting for the regulator from m&p. Need to draw up a plan.

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on December 05, 2016, 12:27:06 PM: There are a few wiring diagrams on you tube tube for m units
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 11, 2016, 09:58:34 PM: Well I've sent my accelerator cables to Venhills to custom make a replacement to fit their 444 push/pull twist grip which I'd bought as a replacement to the O/E twist grip. There records only go back to1979!

Seriously I never new how much work went into these one off rebuilds. Kudos to all the home builders who did this before the help of the internet.

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 18, 2016, 08:12:27 PM: Well people what do you think. Have I missed out something obvious here?
Before I drill, screw, bolt or even cable tie I want to run it past the many eyes here. Thanks (http://uploads.tapatalk-cdn.com/20161218/cb866e675628d109d94a339944a890f3.jpg)(http://uploads.tapatalk-cdn.com/20161218/3af23c390e5da16dd08f64a43c665da8.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on December 18, 2016, 09:37:57 PM: Starter solenoid I would put the reg rectifier underneath for best cooling on it
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 18, 2016, 09:58:04 PM: Thanks Yozzer I was going to put the solenoid in the original place but after what you've just said I'm thinking of swapping the two around, flattening the battery box and attaching the regulator to the box and put the solenoid on the tray. What's ya thoughts?

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on December 18, 2016, 10:49:07 PM: If your keeping battery box I would keep them there you won't have to extend wires then
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 18, 2016, 10:57:00 PM: I'll get the grey matter looking at it again tomorrow. I'll be sure to put it out there when I do. ( never thought of the the heat from the regulator)

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 19, 2016, 09:39:18 PM: Ok so I've made a bracket and welded it to the side of the battery box for the regulator. What do you think?
With it like this I've got a load of room now for the m-unit and the wiring so that's made it an easy way to lift the tray to access the battery. (http://uploads.tapatalk-cdn.com/20161219/d9601ca7f382f77142f3b1e4a36b57b8.jpg)(http://uploads.tapatalk-cdn.com/20161219/04136ac47c64788eafd97f39651625e5.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: mike the bike on December 19, 2016, 10:16:23 PM: It should get an adequate cooling draught by there.
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 19, 2016, 10:21:27 PM: Thanks Mike That's good news. I never thought about it to Yozzer pointed it out. As a result it's actually turned out a better idea.

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Title: Re: My cb750 scrambler build. Restart
Post by: mike the bike on December 19, 2016, 10:28:14 PM: It's the same position as my GS650G, so it'll be fine.
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 20, 2016, 08:37:07 PM: Well now the real fun begins.
Original wiring from battery backs is in really good nick but the front part......wtf! (http://uploads.tapatalk-cdn.com/20161220/ed63f1a694972ec34757e7f0bdec0a7e.jpg)(http://uploads.tapatalk-cdn.com/20161220/8566930bb845f124050f3e803467f4c1.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 20, 2016, 10:38:34 PM: Need help already. So I bought a new solid state regulator from m&p (picture below). All the diagrams I can find show dohc regulator retro fitted. Can anyone help. I'm scratching my head.
Thanks.
(http://uploads.tapatalk-cdn.com/20161220/8180ade30571cb4fdf6754422763858a.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: mike the bike on December 21, 2016, 08:46:22 AM: 3 x yellows are the ac windings on the alternator. Red and green are the pos and neg to the batt. The black and grey (white?) go the inside coil of the alternator, the excitor winding.

Hope this helps.
Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on December 21, 2016, 11:31:37 AM: You won't be using any of the old harness will you ??
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 21, 2016, 10:53:06 PM: Hi Mike. Thanks for the reply. It's the black and white that I'm stuck with. Is there a diagram to explain what your saying as I'm still a bit lost. I got in touch with the manufacturer and they sent me this.
Red. Positive
Green. Ground
Yellow. Stator
Black. Original sence input for regulator
White. Field output for alternator

Hi Yozzer, nope it's all going. Completely new.

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Title: Re: My cb750 scrambler build. Restart
Post by: mike the bike on December 22, 2016, 07:48:21 AM: Dunno what the original sense input is, sorry.
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 22, 2016, 07:56:31 AM: Hi Mike, thanks anyway. I'm going to email them again and ask them to send me a diagram.

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 22, 2016, 08:06:28 AM: This is the last email I got from them
(http://uploads.tapatalk-cdn.com/20161222/b51e79578c592801ebf3fc4608f5ecd6.png)(http://uploads.tapatalk-cdn.com/20161222/12814442b6890f353c60311f06b9ea24.png)

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Title: Re: My cb750 scrambler build. Restart
Post by: mike the bike on December 22, 2016, 08:19:24 AM: It looks like it should also go to the battery, along woth the red, to sense the battery voltage - to measure if it needs charging or not. But that's only an educated guess.
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 22, 2016, 03:45:41 PM: Hi Mike and anyone else interested in this, I've found this online. Does this make sense to you? It seems to work on paper but this is way above my knowledge. Knew I should of sent more time on electronic systems. (http://uploads.tapatalk-cdn.com/20161222/4c57540c4577fd3aa49363777e1c590c.png)

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Title: Re: My cb750 scrambler build. Restart
Post by: mike the bike on December 22, 2016, 05:17:56 PM: That's what I said originally, those 2 wires go to the coil in the middle of the alternator. When the battery is low, a current is made to flow in that coil which then produces a magnetic field which makes the alternator churn out some more leccy (yellow wires). Because it's the back - and - fore type leccy, the rectititifier turns it into one way type leccy that the battery likes.

Sorry about all the technical jargon.
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 22, 2016, 05:25:29 PM: Ohh. Is that the flow field part of the stator?

Thanks Mike, I'll go in with a bit more confidence now.

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Title: Re: My cb750 scrambler build. Restart
Post by: K2-K6 on December 22, 2016, 05:28:33 PM: I like that explanation Mike.

Cheers me up in a gap from buying, fetching and planning stuff for Christmas. ;)

I don't think I'm in any danger of completing the list I've been given, there comes a point when you have to cut and run to the alcohol. I justify that as categorising it officially under tidying up. Well somebody's got to make a start on it.

Now where did I leave those "eat me" dates?
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on December 23, 2016, 01:13:11 PM: Venhill custom made cables. Loverly bit of kit. (http://uploads.tapatalk-cdn.com/20161223/6553317a909e3ba415f829af0a209efc.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: totty on December 23, 2016, 08:46:13 PM: With original wiring the plug goes in place of the rectifier and the two loose wires go to two out of the three regulator wires, the third one being an earth that is no longer used. The sense wire is an ignition switched live.
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on January 24, 2017, 09:31:07 AM: With big help from people on here, the wiring of the beast has begun. Every time I think I understand it it kicks me in the face. Starting to slowly get now. I think. (https://uploads.tapatalk-cdn.com/20170124/40e456d4d8340bc97644627bf04104cd.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on January 28, 2017, 08:24:14 PM: Regarding the wiring I'm using a m-unit and m-button but after market switch gear.
The switch gear I'm using has three wires for the lights, dip main and a common as do the indicators left right and common and two wires for the horn. My issue is I don't know where the common wires go. I know they are live.
A wiring diagram if anyone has one would help. Thanks for looking.
(https://uploads.tapatalk-cdn.com/20170128/0d37bc7506ce357e0127fba402fcb1cc.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on January 28, 2017, 08:38:33 PM: If you look on mr t build thread he put a wiring diagram on for the m unit . May help you out
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on January 29, 2017, 10:00:28 PM: Thanks buddy but it was no good for my set up.
For those who are interested after a lot of trial and error the common is the live that goes to the m-unit.

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on February 14, 2017, 10:11:51 PM: Well a late one tonight. I've wrapped the exhausts that took an age.
These 4-1 exhaust systems are a bit of a pig to fit though. Anyway it's another job done. (https://uploads.tapatalk-cdn.com/20170214/01344c79f088293f9fe875aa6a2df615.jpg)(https://uploads.tapatalk-cdn.com/20170214/173d81f5b20e38d6671a0dc3d2ff022f.jpg)

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Title: Re: My cb750 scrambler build. Restart
Post by: Nurse Julie on February 15, 2017, 08:49:17 AM: Ok, stupid question time..........why do you bandage your down pipes?
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on February 15, 2017, 09:38:54 AM: Hi Julie, the scientific answer is that the retained heat helps the gases flow better and helps keeps the optimal operating temperature more stable. The real answer is that the previous owner had sent the old one scraping along some Tarmac and I didn't want to shell out for a new exhaust. I'm already about a grand over on the spend!!

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Title: Re: My cb750 scrambler build. Restart
Post by: mike the bike on February 15, 2017, 12:46:47 PM: The bandages will help the scrapes to heal properly. Come on Julie, I thought you knew that.
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on February 15, 2017, 01:10:30 PM: Oh yeh and what Mike said.

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Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on February 26, 2017, 10:54:42 PM: So I've had a massive issue with the engine so I'm back to where I was back in October. This is a bit disappointing but it needs to be right. (https://uploads.tapatalk-cdn.com/20170226/00ec5c7c63127b0bb6d9faaa4103f9e1.jpg)(https://uploads.tapatalk-cdn.com/20170226/cd2f3bee865e1030ad3ea944d9ab7d63.jpg)(https://uploads.tapatalk-cdn.com/20170226/51a771d00fa24dc77ab763f41852f1ef.jpg)(https://uploads.tapatalk-cdn.com/20170226/11320bd703031c5bd42b4b63cebecf14.jpg)

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Title: My cb750 scrambler build. Restart
Post by: onethumb on February 26, 2017, 11:03:54 PM: With all the information gained from this forum and the fact that I did it last year I've managed to do this on my own. I do think that every thing is new has made a big difference though.

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Title: Re: My cb750 scrambler build. Restart
Post by: mike the bike on February 27, 2017, 08:16:41 AM: Bloody hell, talk about 3 steps forward and 10 back, what's up with the engine?
Title: Re: My cb750 scrambler build. Restart
Post by: Bryanj on February 27, 2017, 08:25:18 AM: For some reason my geriatric desktop running 97 wont show me pictures loaded using tapatalk so i can't help
Title: Re: My cb750 scrambler build. Restart
Post by: onethumb on February 27, 2017, 08:25:29 AM: I noticed blow back through the carbs on number 1 cylinder when hand cranking it over before filling with oil so I could start her up.
Suspect head issues with valves not seating or a bent valve. Trigger gave me the details of someone who can sort it but I need to get the head to him.
On the plus side I'm getting good at stripping her down.

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Title: Re: My cb750 scrambler build. Restart
Post by: Wenman on June 30, 2017, 10:03:43 PM: Anyone know what happened with this build? It was looking great and I was hoping for an awesome finale but it just ended??
Title: Re: My cb750 scrambler build. Restart
Post by: yozzer74 on June 30, 2017, 11:33:25 PM: He's still on with it I've seen it on a page on facebook . Engine is back together and he's on with wiring .