SOHC.co.uk Forums > CB500/550

MISFIRE ON NO4 CYLINDER

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blade918:
HI ALL FINISHED REBUILDING MY CB500 K2 AT LAST 123 CYLINDERS PERFECT NO4 MISFIRING WHEN I TAKE PLUG OUT REALLY BLACK AND SOOTY [RICH]CARBS HAVE BEEN SONIC CLEANED DOUBLE CHECKED ALL JETS CLEAR IT HAS HAD ALL NEW COILS HT LEADS PLUGS POINT CONDENSERS BUT IM STRUGGLING TO UNDERSTAND WHY IT WILL NOT FIRE ON NO 4 ANY HELP APPRECIATED MANY THANKS KG

Bryanj:
Please dont shout! If the plug is black its too rich.
What bits did you change in the carbs

Athame57:
Does it fire properly for a while after cleaning the plug, after all it managed to get sooted up. Also, are you sure the carb was reassembled properly. I ask that because my own bike managed to come out of a workshop with a needle jet tube missing, :o  lotsa smoke and misfiring. I finished the job myself.  ;)

Seabeowner:
These bikes run rich at tickover. What do the other plugs look like? If it's the only one rich then usual suggestions: float height: fuel leaking past the O ring seal on the main jet: blocked passageways in carb

Johnny4428:
Faulty plug?

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