Honda-SOHC
SOHC.co.uk Forums => CB750 => Topic started by: F2 Paul 876 on May 23, 2010, 08:32:51 PM
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Hi All this is what i have been doing over the last few weeks. My plan was this year just to sort out the engine i.e. do the valves and cam-chain and re paint and fit new tyres as this is all i thought i need to do when i put the bike in the shed a while back, so it took a few dry w/e to sort the shed out as i could not get to the bike or have any room to work on it god did i collect some junk.
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This done i then got the bike out in to the daylight for the first time in a few years.
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I then spent the next few days slowly taken it apart, not too much trouble no broken studs or bolts of my making found a few that others had done, the exhaust clamp had one bolt snapped off and the sump plate had been changed as it was not black so a replacement one and they had snapped of one bolt head thankfully there is a lot of the bolt left so hopefully should get it out with out to much trouble (here
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Sorry looks like a prob with the photos again, cant seem to be able to post into the text ??.
Will try again if i can work it out ?
Paul
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You've not included the actual url in between the [url] tags.
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Hi Steve i have tryed a few ways but all seem not to work, i would like to put the photos in with the text like i have seen others do but i cant seem to do this, i have a copy of your how to do it but i must not be doing it correct some where. Sorry for this.
Paul
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http://www.sohc.co.uk/index.php?topic=907.0
http://www.sohc.co.uk/index.php?topic=908.0
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Here are the photos i hope 1st four
1st the shed at the start.
2nd after a w/e clear out.
3rd and 4th the bike out in the sun light at last.
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More
1st The start of the strip down.
2nd The frame showing the rust thankfully most of it is surface stuff.
3rd The engine needs the valves and cam chain sorting and a repaint.
4th Now to start the refurbishment.
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Scary stuff, at this stage it always makes me wonder if I'll ever get it all back together !
Cheers
Den
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Thats looking good paul, well done for getting stuck in, the bike looks pretty good condition so hopefully you wont have to spend a fortune on it, saying that when you start on the engine its very hard to know where to draw the line renewing and reusing bits, thats where allot of the money seems to dissapear
Pete
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Hi Thanks
I have the paint for the frame any way (cost nothing)and a lot of the other things i need , i had to get some Gunk for
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Check valve stem to guide play, especially on exhaust side, as thats the BIG wear bug with F2/3
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Thanks i will make shaw they are ok thanks for the pointer.
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Just a quick up date, aim on Hols this week so have plans to get as much done as i can.Today i stripped the paint of the frame, next i shall sand the rust of the frame then paint it as the weather looks good for the rest of the week i should have this done by Sat i hope ??.
When i tried to take the main stand of i had a bit of a fight with it, could only get the pivot a small way out, so out came the anglegrinder and job done,looks like i had the same problem years ago as the part number is ticked in my parts book a look at the other bike and yes new pivot fitted.
More when i get it done.
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Making me feel guilty here as I should be painting up the rest of my F2 parts, did a load last year, but this fine weather has kinda snuck up on me !
Cheers
en
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Hi not a lot done today, got the undercoat on the frame 2 large cans used. This could be the most paint thats been on the frame by the small amount i took of with paint stripper, and there is still the black to go hope to get this done by late Saturday.
The swinging arm is next striped it, now to de-rust it then paint.
The main stand is started a lot of rust on this should take me about a hour to sort it then paint.
The fumes are not as bad(or good) as the old paint and paint stripper used to be, our them where the days, only now have to watch out for spray that gets blown back over me as now my specks get covered only need them for reading and close work now did not have this prob last time i did a bike up in the last century>
Till next time
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More done today, frame has had 1st coat of black, 2nd will be over the w/e.
Swinging arm now looks better, 2nd coat all so at the w/e.
Next big clean / paint is the batt holder this is in a state battery acid on it from a split battery.
See ya Paul
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Hi all aim on my forced FIA 2 week hols just now so i can get on with more work on the F2.
I have done some on it since i last updated this page.
Frame done, swingarm done main stand done, rear wheel 4/5th's done, plus a few other small things.
I have had the rear shocks taken apart at work in the shock bay as the have all the kit to take shocks apart, and they said they are shot only good for scrap, so looks like new shocks, or plan 1 i have a set of Hagons on the other F2 i have that is a long way of being finished so could use them or plan 2 could get the Marzocchi ET 85's that i had fitted years ago to the other F2 repair ie seal kit Mdina Italia up in Yorkshire have these kits at about
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More Photos
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The wheel is coming along fine, just need a few of the plastic spoke covers now to finish the look if i can find some ??.
The sprocket is on its last legs so a new chain and sprocket set, the cost is going up !! ???.
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Even more the foot peg brackets and air box top brackets done just need to put back togeather now.
The batt box finished got the Electronics's bay to put some heat shrink and padding on this not bad.
Now to get more done, i shall try to get the obligatory cupper in the next lot off shots :D.
Paul
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Looks good so far, though watching all this activity seems to be something of a substitute far doing something on my own bikes.
One of the mods we used to do on these bikes in their prime was to replace the lock stops on the lower fork clamp with a larger square block welded on as they break really easily and even a simple fall from a side stand can dent the tank as it runs so close to the back of the legs / handlebars.
It's good to see the whole build taking place, thanks for your efforts in showing us.
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Hi Interesting i have never had that happen to me, Ive dropped one down the road a few times and it's fallen off the stand a few times.
I have noticed that the tank can move forward if not fitted right could be part of the problem.
Yes i was like you for a long time not getting on and starting doing the bike, then a a few of the lads at work have being doing up bikes / track bikes. I keep ed on saying that i have one and they just jeeped on at me to start so i did, i started this one (took them 6 years to get me started) i still have one more to finish which will get done once this one is complete .
The one that is on hold is the one i have had since 1979 the one in my Avatar thats a bigger projected.
I have got just a few things done today, wheel last bit of paint on it, and i have cleaned up the disc ready for painting and cleaned up all the spacers an spindle plus a few small brackets got ready for painting hopefully tomorrow. then more bits to sort never ending.
I will post more photos later on friday.
Paul
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Bit more done, Rear wheel finished as far as i will go just now tyre and sprocket will get done just before it goes back on the road.
More time on it next week i hope.
Paul
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More photos
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Rear wheel finished 1st major part done :o
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My shocks the end of the road for the ones that come of the bike.
The Marzocchi ET 85's that i hope to fix and fit to the bike.
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I have a pair of shocks available that would fit a CB750F2...or even a 750F1, CB900F, CBX1000Z etc...
(http://i666.photobucket.com/albums/vv23/WiNot_Rhencullen/20091125_11.jpg)
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I guess the original shocks were not of a high end spec anyway, they did the job and I thought they weren't too bad compared to others at the time but by no means a precision spec that we may be used to now. I would have thought that they're worth keeping in stock if not serviceable just because they represent an orignal part of the bike.
You say that you had someone look at them at work who thought they'd had it, it's likely that they would say the same for a spec like that when new anyway as they just would not match up to any critical current appraisal anyway, spose things move on like that!
That looks like a Yoshimura pipe in your heading photo? always liked that design for SOHC 750's, just really neat looking, Bubadel also has the same on his one elsewhere on this site.
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Hi All
Tim thanks ref the shocks, i aim doing this one up as close to Oreg spec as i can. They would go on the other F2 when i get around to finishing it as this has not been Oreg spec since i have had it since 1979 and has changed over the years, if you still have them when i get around to finishing it i poss would take them off you thanks.
The ET 85's with a little stripping of paint and re paint/polishing would not be far of the mark.
The old ones i shall keep just for ref and one or two bits are OK. The shocks have no oil left in them and are sealed so can't be refilled that is what they mean by shot fit for scrap, the springs are fine they said.
Yes that is a Yoshi i got that one from Dave Dixon (spoke to the man him self he told me how to up jet the carbs and the set up for it) at the Jan bike show in London at the halls in SW1 in 1980. It has run Yoshi's since the last one a black one has just fallen apart with the rust monster mite be able to sort it ?. Will look for a new one if i can find one these days. I have looked on the Yoshi web site but not any thing on it ref older bikes, they sound great quite at tick over they have a one off sound then still quieter at low rpm as soon as you hit about 5500rpm they start to come alive and at full chat music 8).
Used to come out of the camp gates and blat it down the A 15 towards Lincoln,or on the way back, the blokes on the gate allways knew when we were on our way a GS 750 all so with a Yoshi, a Rickman Z900 no back pipe fitted just straight pipes a Triumph 750 with megs on it, Z650 stan pipes GS 550 Stan pipes plus a Gt550 Trip doing the smoke screen act and a CBX 1000 with six in to six think they were marshalls or was it Marvin's they where load any away, them were the days ;D
Yes Bubadels bike has the same Yoshi on it as mine.
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Ref Yoshi Pipe - look at this site www.cb750cafe.com (http://www.cb750cafe.com). Ex pat brit who runs the business, Carpy, "as he is known in the trade", supposedly does a close replica. They also seem cheap enough but then import duties / vat?
Tim
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Thanks his site is all ready on my Favorites bar, normally have a look every few weeks at the site. Tims F2 is on it.
I would like a gen Yoshi if i can find one, His one will do just fine if i can not find one it dose look really smart and looks like better ground clearance than the Yoshi.
I have a good while yet before i need one no hurry at all.
Paul
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Steve Carpenter ("Carpy") is indeed an expat Brit - drop him a line - he loves to hear from Honda owners from back home!
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I found that the original downpipes, once welded up with the joins for #1 & #3 solid, gave good power & ground clearance. The first silencer that I went to from standard was a Harris Racing track outlet pipe...
(http://i666.photobucket.com/albums/vv23/WiNot_Rhencullen/My750010-1.jpg)
...but this got damaged after an off on some diesel...
(http://i666.photobucket.com/albums/vv23/WiNot_Rhencullen/My750021-1.jpg)
So I had one made for me by John Campbell at CG Exhausts in Dartford. John still makes stainless exhausts for anything nowadays & specials & one offs are his speciality. But in those days it was all mild steel & once chromed they complemented the original downpipes nicely...
(http://i666.photobucket.com/albums/vv23/WiNot_Rhencullen/My750034-2.jpg)
(http://i666.photobucket.com/albums/vv23/WiNot_Rhencullen/TimsCB750F3-4017.jpg)
At first I didn't mind the chrome, but it didn't like the welding when the downpipes were welded, so the whole lot was shot blasted which removed the chrome & I painted the lot with Kal-Guard Gun Kote...
(http://i666.photobucket.com/albums/vv23/WiNot_Rhencullen/scan0009.jpg)
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Looks like we where going down the same line at the same time. Same Tank which i still have same fairing (still have) at some times, i later fitted a Rickman front fiberglass mud guard still got. Most of the stuff will go back on the bike when i get around to doing it, but i hope to finish it all to a much higher standard than i did first time, there is only so much spraying / rebuilding you can do in the barrack block ! :D.
I only had the head gas flowed and that was done free by Towcester tuning when they did the last engine rebuild for me. They had just got the kit in so need a engine to try it on and as mine was in the shop at the time i got the free gas flowing.
they are still going of sorts just down the road mostly cars now.
I remember Campbell Germetric's ? a blast from the past.
Paul
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Brilliant old photos coming out, nice to see some stuff from this era.
I had a yoshimura pipe on a K2 (bought it at the dixon shop in Godalming) black one as yours mostly rotted from inside but still have remains. Also have access to a almost new one on 750 F2 the owner of which said I could use to get a copy made............. so loosely thinking of exploring getting one made in stainless have done no work on it so far and guess that it's not possible to market someone elses design. So if I can find a scource then see if any interest in getting some made as a group together kinda thing.
As you say they have a wiered balance between quite at low revs along with a good top end noise plus good flow.
I bet that CBX sounded sweet!!!!
Kal Gaurd.......there's a blast from the past. Mostly used their "Chain Kote" since the seventies and now the only one I buy, the graphite one. This makes chains last longer than anything I've seen just apply it when you get home after a run and it stays on the chain then.
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Count me in if you do pattern up a a "yoshi copy".
Tim
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Nice bit off tangent stuff there but lets get the thread back on line.
I have done a bit more, cleaned and polished up a bit of the rear mud guard.
I have done the airbox got that back togeather just a new airfilter for that now.
I have done one front right side foot rest the left one is ready to put back togeather but i have lost the spring, it shoot off as i was cleaning it up with the wire brush in the elct drill, it hit the wall a few times its some where but still cant fined it should come across it some time.
Took the metal bit out off the top of the rear mudguard and have cleaned this up its got its undercoat on should get the top coat on this comming sat if i do not find time in the week.
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The Footrest photos right side only.
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That metal bit from the rear mudguard, did not take as long as i thought it would to clean up the state it was in.
More at a later date when i can find time to get on with it.
Paul
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Nice detail, what do you use on your plastic to clean it
pete
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With referance to the Yoshimura exhausts from Dixon Racing, I don't think that they were genuine Yoshi at all, but stuff that was approved by the Yoshi factory. The one for the 750/4 & the 400/4 were so differant in design that this is why I have come to this conclusion.
There was a road test in Motor Cycle Mechanics years ago of a 750/4 that had been prepared by Dixons, & John Robinson wasn't kind to it in his article. The exhaust was dangerous as it reduced ground clearance considerably & I have a picture in my mind of the length of the silencer section having a long graunch in it from just such an occasion.
Does anybody still have the Dixon Racing catalogue from that era?...not the later one with the CB900FZ/GS1000 stuff in it but the earlier one. I have mislaid my one, but I still have the genuine USA copy.
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You could be right with that one as they do seem inconsistent with the look of track stuff that Yoshi made. The top of the silencer tube was peaned (dented) inwards to get it close to the bottom frame rail and lift it as close up as possible but the curve from center to outside of the bike seemed to be arranged to clear a center-stand, if that were not fitted you could run it further under the bike. So maybe more of a replica for the road fitment than pure race type.
I ran one on a K2 and it seemed to give more clearance than standard 4 set but it did scrape a bit but considering the tyres then it felt like close to the limit anyway.
Apologies for off topic, maybe needs a spot of it's own if more discussion.
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Hi I have allway understood that my pipes were gen Yoshi road pipes that Dave Dixon sold i had one from him and one from some one Else that i cant remember who both the same except finish, the track use ones as far as the brain cells remembers were diffrent. I had clearance problems getting up and down kerbs/ steps all ways scraped the bottom, to park off road at the old dears place had to go up kerb and then a big step to get in and out of the garden. The lean on the left side was OK the right side less clearance i found that the main stand did not go as far up with the Yoshi fitted but once you got used to it it was OK and as Pete says you were close to the limits of the tyres in them days. Yes we should open a topic on Yoshi's as all the SOHC cc's used them. I would be interested in some remakes if we could do it at a fair price.
Pete I clean the plastic first in gunk then wash it off then use the Foam cleaner then the All for one you have to use the all for one a few times to build up a base then polish dry with a soft cloth. do not use brake cleaner at first to degrease as it takes ages to clean the stains that it makes of the plastic thats why i now use Gunk on the plastic bits its kinder to it.
I think aim going a bit OTT on the clean up, but i have started now so it would look naff if i only did 1/2 , i am all so trying to use all the nuts bolts washers that came of the bike and if i just left them dirty they would not look right. It is all done with wire brush and Rol locs scotch brights and sanding disc's on a black / decker and with a small bit of detail with wet /dry by hand.
Till next time Paul
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It's looking good with all those bits cleaned, don't see why you shouldn't clean and prep all the pieces as you'd probably regret it if you wanted to do it later.
Followed a friend on F2 years ago and saw him lift the rear wheel just enough to make it slide! when lent on to standard pipe RHS and only just stayed on it so clearance is always an issue if you ride it like that. Probably has just as much to do with rear shock compression damping as well as there was a dip mid corner that effectively bottomed it out.
Marzoccis or S+W replacements would be good period mods for it, girlings were ok but seemed a bit crude and seemed to have high spring rate.
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Yes thats what i was thinking when i started to clean it all up yes i would probably regret it and it would be a lot easier to keep on top of it once back on the road so thats what aim doing now.
Got the rear mudguard metal bit finished now painted and lacc on it, got some small 4mm bolts to replace the the ones that broke and sorted the other fixings ie the rivet ones on the mudguard replace with stuff from work as had to work today.
Aim going down the Marzocchi route. NJB shocks are Girlings under a new name by a bloke that worked there i had a pair of dial a rides i think thats what they where called did not last long only about 60k before they where shot was not overly imprested with them.
The Maziss were the best i have had on a F2.
See ya Paul
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Well i have finished the toolbox/rear mudguard just got to refit it to the frame later.
Not to bad a finish on it plastic was quite scratched would not polish out as a
Polly-type plastic and this dose not polish up to good.
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I had to change some of the fittings, i have not reused a rivet as i could not get any that size, so i used a CSK bolt and a K-nut this dose allow allot essayer dismantelling again and refitting.
The toolbox flap screws got chewed up when i took them out so i have replace with button heads they do not look to out of place, if i come across some of the Oreg ones i can quickly replace with out to much trouble.
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I have all so made a start on the oil tank, not going to strip all the paint off as the front face is ok and has quite thick paint on it unlike the rest of the parts. It was mostly the back that needs de-rusting and cleaning up.
I have got about 1/2 way now, just need to buy a 27mm spanner this week so i can take the oil pipes off so i can get into the space around the back of them to clean it and the pipe fittings.
I will hopefully get this done some time in the week after i get the spanner.
Till later Paul
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Looking good, I can remember this stage on my F1, it's nice when it's all cleaned up, I use Auto Glym stuff on all the plastic stuff, comes up well.
Cheers
Den
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It's been a long time since i did any thing on the bike to many other projects that i need to do.
I have finished the Oil tank and the rear brake light switch bracket not to bad a finish i used double acrylic on them we had some spare !! at work.
I just need new oil seals should have these at work as we have about 400 plus seals that we have on the shelfs.
I do not think i shall get to much done now for a few months as busy time at work now till march, so on hold till then, plus the shed has no heat, me getting old now Me's think.
Till next time Paul
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At least your'e getting through some of the tasks whatever pace it's at. Nice when you realise how far you've got and there's less to finish to complete the rebuild.
Just look how much space there is under that seat/tail unit, that's mostly gone on new stuff.
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Well done paul it all looks good, every little bit counts if you keep at it one small bit at a time it will all come together, i am struggling to get anything done on my F2 as i have been working hard and also doing work on my kawasaki's and taken a break from the SOHC bikes, but quite the opposite to you i have now packed up work for a month or two and will have plenty of time on my hands so i will get the F2 out and do bits of work to that as well
Pete