SOHC.co.uk Forums > CB500/550
500 engine strip
matthewmosse:
How different are 500 and 550 selectors, I have a few engines that came as boxes of cogs and they are all a mix of 500 and 550 bits, been 10 years since I built anything up out of it, I seem to recall most bits were possible to interchange, but some annoying differences, like having to tear the whole thing appart to swap the actual gear shaft to fit the cluch, took many long hours of trial and error to make a viable engine - gearbox was good, shame the crank seized (think it was petrol washing the oil out due to bad rings on piston and sticky float but given that I was utterly clueless and working in a caravan between shifts, maybe some dirt got in there.
mickwinf:
Hi Matt, I have checked my parts books and the 550 is different part number, not sure how to tell difference without comparing side by side, if you do have one I would buy it!
matthewmosse:
I'd keep looking over in Us of A to be honest Mick, I might well have one, but my workshop is a right royal tip and it will take me an age to find one, and identify it as 500 rather than 550. Could take an age. I wonder could a worn one be built up with weld then machine it back? I would need to be really accurate and re case hardend. I think my 500 may need the same part - does it select 1st gear by any chance? Does seem jumping out of 1st was a common 500/4 issue thinking on it.
Trigger:
Mick, you can't go by part numbers. I know that CB500T forks are identical to CB500 and CB550 but, all have different part numbers. As you say the only was is to match these side by side.
matthewmosse:
If 500 and 550 forks were the same then I have plenty, but I don't think they are - been a decade since I did a mix and match rebuild though. I have a shed to erect, a big tree to fell in a tricky spot that has to come down first and then I'll be able to clear enough space to work on an engine. Not gonna be fast. Until then no knowing where any given for in the spares boxes came from.
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