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SOHC.co.uk Forums => Project Board => Topic started by: xriccix on May 22, 2017, 09:36:19 PM

Title: 1975 CB750 K5 Chopper Project
Post by: xriccix on May 22, 2017, 09:36:19 PM
So here we have what will be my first bike build project and I warn you know I will be learning along the way! It's also worth saying that my wife and I are in the middle of moving from Brighton to Bedford to be closer to family, this will take a while!

(http://i.imgur.com/LPYrffw.jpg)
(http://i.imgur.com/xYfYY7t.jpg)
(http://i.imgur.com/ltuLmLL.jpg)
(http://i.imgur.com/hAnPuvO.jpg)

That's the bike as it currently sits, I also have 3 boxes of bits which have everything else in.

Things I'd like to do to the bike:
Engine refurb
Paint engine in VHT wrinkle paint
Powder coat frame
King and queen Seat
Bigger sissy bar
Forward controls
Coffin/Peanut tank
Dual Carbs
Springer or Girder front end

Any help or advice about the above list would be greatly appreciated!

Title: Re: 1975 CB750 K5 Chopper Project
Post by: xriccix on July 29, 2017, 12:47:38 AM
As I cant work on the bike right now I thought i'd post some pics on parts that I have bought for it :)
 
Springer arrived and I'm super happy with it, needs some work but for the price I paid it was an absolute steal.
(http://i.imgur.com/uMWAsE6.jpg)
(http://i.imgur.com/MW71HeZ.jpg)

Got 4 of these bad boys as well!

(http://i.imgur.com/WvD85Do.jpg)
Title: Re: 1975 CB750 K5 Chopper Project
Post by: MarkCR750 on July 29, 2017, 07:42:38 PM
Good luck with the project, there aren't many on here with that sort of bike but it's always interesting to see a new machine being created, looks like there's a fair bit to do!.
Title: Re: 1975 CB750 K5 Chopper Project
Post by: Seabeowner on July 29, 2017, 10:38:11 PM
Yes choppers are pretty rare these days. It's seems either restore to stock, ride it into the ground or spend, spend on cafe racer with M unit stuff. I remember the likes of Leon Wallace customs in London. At least you can guarantee some help on the engine here and keep the posts and pics coming.
Title: Re: 1975 CB750 K5 Chopper Project
Post by: xriccix on July 31, 2017, 11:52:46 AM
Good luck with the project, there aren't many on here with that sort of bike but it's always interesting to see a new machine being created, looks like there's a fair bit to do!.

Yes choppers are pretty rare these days. It's seems either restore to stock, ride it into the ground or spend, spend on cafe racer with M unit stuff. I remember the likes of Leon Wallace customs in London. At least you can guarantee some help on the engine here and keep the posts and pics coming.

Cheers boys! I'll update as often as I can!
Title: Re: 1975 CB750 K5 Chopper Project
Post by: xriccix on March 10, 2019, 05:41:06 PM
So its been a hell of a while, new job and new house took a lot longer to get sorted :)

Small update from me, Garage is now finally ready for the CB750 frame and engine coming out of storage this weekend. Bench was built by my brother in-law and myself, only cost around £50 as he had lots of free wood :). Still not the biggest space but should be fine for what I need.

(https://i.imgur.com/j5Ifd8u.jpg?1)

First job I want to get sorted is the carbs. This is the set that came with the bike, from what I can see right off the bat there are a few missing bits, a couple of nuts, throttle return spring and plate spring setting. The plate I just got from Germany for a stupid price, but oh well! Thinking about Chroming the bowls and maybe painting the screw tops black. 

(https://i.imgur.com/DijVAun.jpg?1)

Apart from being filthy the carbs look good, took the bottoms off and looks clean inside, I'm still debating a full rebuild. I guess it will come down to if i used a bread box or velocity stacks and therefore might need to use different jets.
The options I like are both from http://www.steeldragonperformance.com and sexy as hell.

(https://i.imgur.com/4Y3CcRD.jpg?1)

(https://i.imgur.com/yiqwStH.jpg?1)
I'll update again after the frame is on the bench.
Title: Re: 1975 CB750 K5 Chopper Project
Post by: xriccix on March 10, 2019, 05:45:04 PM
Went through the big box of bits I got with my bike today. No idea where half of it came from?!

(https://i.imgur.com/Pva19dp.jpg?1)
(https://i.imgur.com/ina2rMJ.jpg?1)
(https://i.imgur.com/bTXQ0pR.jpg?1)
Title: Re: 1975 CB750 K5 Chopper Project
Post by: Moorey on March 10, 2019, 07:09:45 PM
Nice to see someone doing a chopper.

If its a poll. Dual airboxes for me.  :)
Title: Re: 1975 CB750 K5 Chopper Project
Post by: SumpMagnet on March 10, 2019, 08:52:03 PM
For the sort of bike you are building, those twin chrome airboxes would certainly look the part.
Title: Re: 1975 CB750 K5 Chopper Project
Post by: xriccix on August 17, 2019, 06:45:40 PM
*Update*

Started pulling apart the engine, I noticed the case was damaged as I pulled of the starter cover. Hopefully this isn't to hard to fix?!

I also seem to have lost my shop manual, god knows where it could be! As soon as I get another copy sorted I shall be stripping down further.

(https://i.imgur.com/1S3j3Jk.jpg)
(https://i.imgur.com/ZrhnMBt.jpg)
(https://i.imgur.com/V1MmLWF.jpg)
(https://i.imgur.com/aio3dk8.jpg)
(https://i.imgur.com/dqP8ltU.jpg)
Title: Re: 1975 CB750 K5 Chopper Project
Post by: Moorey on August 17, 2019, 08:38:31 PM
Just look in Aladdin's Cave for manuals.  :)
Title: Re: 1975 CB750 K5 Chopper Project
Post by: xriccix on August 17, 2019, 11:23:36 PM
Just look in Aladdin's Cave for manuals.  :)

I have it as a PDF, just prefer a hard copy :)
Title: Re: 1975 CB750 K5 Chopper Project
Post by: Moorey on August 17, 2019, 11:43:36 PM
Break out the printer and encapsulator, easy wipe clean. :D
Title: Re: 1975 CB750 K5 Chopper Project
Post by: Rob62 on August 18, 2019, 11:33:05 PM
I like the look of this, very different to the usual rebuilds.. my vote goes to the velocity stacks..... that top end looks a bit dirty unless its just the photo, maybe a full engine strip down would be a good idea.. Good luck, keep the updates coming!
Title: Re: 1975 CB750 K5 Chopper Project
Post by: xriccix on August 19, 2019, 12:43:37 AM
I like the look of this, very different to the usual rebuilds.. my vote goes to the velocity stacks..... that top end looks a bit dirty unless its just the photo, maybe a full engine strip down would be a good idea.. Good luck, keep the updates coming!

Thats the plan bro, gonna do a full rebuild, gonna be a challenge :)
Title: Re: 1975 CB750 K5 Chopper Project
Post by: SumpMagnet on September 02, 2019, 10:00:47 PM
Nice to see something different :)

I have dabbled in custom bikes in my younger years, never went the whole hard-tail route. Bumpy roads and all that ;)

Whilst it may not be for the purists....these things need preserving same as any other bit of history.

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