SOHC.co.uk Forums > CB500/550

CB550f running too rich on Marshall exhaust...help please

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LesterPiglet:
I've heard bad reports about Keyster and always have had original replacements recommended.

pptom:
I would think an exhaust change would make the bike run lean if anything, what size are your main jets? are the floats sticking open allowing too much fuel in? did you set them correctly? needle jets too small? rubber O rings good fit on the main jets?
Can't think of much else - generally 'mods' will make the engine run more lean.

Bitsa (Ralph Wright - RIP):
Hi All,
Back in the 70s my mate had a 500/4 and when the original pipes rotted he replaced the system with a 4 into 1 motard.As I remember going through southend his bike popped and farted around so rich it coughed out black smoke.When I did the same with my 750 I remember up and down to plug test and finally got set with 112.5 main jets.In those days easy to get.Its a matter off flat out kill coast and plug check providing float heights and air intake plus all airways clear.
Cheers
Bitsa

buzzens:
Once again thank you all for your replies. I too have heard about Keyster carb kits been a problem, they list the jets as per standard CB550F. The kits I got are from a company in Canada; Cirrius i think was the company name or something similar. I can't find any genuine kits anywhere at the moment, so I think my chances could be slim, maybe look out for a 2nd hand set of carbs.
Cheers

buzzens:
I have now finally traced and purchased NOS 3 needle & jet sets which now completes all the parts I require to put the carbs back to original Honda from the Keyster kits, this includes NOS main and slow running jets purchased quite some time ago. Just got to find the time to do it now...

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