SOHC.co.uk Forums > CB750
My F2 Rebuild
Yoshi823:
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.
K2-K6:
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.
F2 Paul 876:
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
K2-K6:
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.
F2 Paul 876:
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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