SOHC.co.uk Forums > CB500/550
flat spot
Bitsa (Ralph Wright - RIP):
Mick
Its a start mate back in the days bozos thought more lift more fuel goes faster they did not realise it screwed most up.Honda put them in the middle for a reason
Best of luck and also the last 400 I did all the o rings were knackered leaking more fuel again.
Cheers
Bitsa
Ashdowner:
What colour are the plugs?
mickwinf:
plugs are slightly sooty but not real bad, haven't had time to do anything further yet.
deltarider:
Always start with the simplest and check the ignition (all items) and doublecheck before you move to the carbs. What plugs do you use and what's the gap?
https://www.youtube.com/watch?v=t3cuvGVwnjI
Left condensor (1+4) is bad, right condensor (2+3) is good. Condensors seem to go bad when warm.
Floatlevels have to be checked. Where's your CB500 from? Yanks had the needles in 4th (combined with the airscrew 2 turns out, at least that's what an American Honda booklist says). In Europe we had the needles in 3rd and airscrews 1 turn out. What main jets are in? Is there a cover over the airfiltercase? A forgotten cloth?
mickwinf:
its a UK bike, main jets 100 as per Honda, pilot jets 40 and have been cleaned, float levels checked and are correct, all rubber o rings replaced, all air filter parts are original and good, no air leaks, I have tried without filter but no better. ig timing spot on and all four cyls firing fine on tickover and higher revs, so the only thing left to try is the needle position, I don't think I checked them so that's the next step, thanks for the imput guys.
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