SOHC.co.uk Forums > CB750

Box section swing arm?

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SamCR750:
Did it come from the States Sean and are you sure what year it all is ?

Arch stanton:
Yes. Surely only the Yanks could find that attractive.
Its a lash up to be honest. 71 K1 chassis on a J plate.
With a K4 engine. I really only bought it for the engine & carbs. I have my old F1 rolling chassis & thought I would use the engine in that. But a F1 is well...just that. An F1.
So I decided to use the 71 K frame instead. This is never going to be a "investment bike" it's for riding & posing on.
It has Menno paintwork F1 forks with twin F1 brakes.
Koni's 2/4 seat Bellmouths, serck oil cooler, & a black early 70's Marving 4into1 pipe without baffle. + rebuilt F1 clocks.
I have tried to repeat my resent pic posting success. But failed miserably.

SamCR750:
You shouldn't have a problem mating the K4 motor with the F1 chassis but measure the top stubs on the frame where the shock fits to be sure. If the near side one is longer than the off side one you will run in to problems.
I've checked the measurements of all the frames except the F1 and all the 750 motors will fit in any frame as will any swingarm, it's when you come to fit the shocks and drive chain that the problems start.


Sam. ;)

Arch stanton:
That's fine. But I can't see me using the F1 frame any time in the future. I loved my F1's back then. But now I prefer the K models. Besides I have for some unknown reason a thing about J red,g bikes.
Sean.

SamCR750:
Sean, can you check the lengths of the top mounting stubs on the frame of the F1 please (if you have the time) ?

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