SOHC.co.uk Forums > CB500/550
3 cylinder 550
mickwinf:
thanks for advice guys i had it running again tonight, it seems to fire on all four when the throttle is blipped but on lower throttle openings still on three, so maybe carbs are the problem after all! petrol is getting to carb ok and vent pipes are clear, no extra sparks in dark.
matthewmosse:
If the fuel line is blocked or kinked or has a poor flow from a filter then I've found number 4 can go out of play. On my bike it was intermittent and due to a cheapo filter that wasn't allowing enough flow, also it was quite tight to fit a filter in so the pipe was bent at a funny angle and was restricted.
flc:
--- Quote from: matthewmosse on March 08, 2011, 09:54:38 PM ---If the fuel line is blocked or kinked or has a poor flow from a filter then I've found number 4 can go out of play. On my bike it was intermittent and due to a cheapo filter that wasn't allowing enough flow, also it was quite tight to fit a filter in so the pipe was bent at a funny angle and was restricted.
--- End quote ---
i have to agree with this, as today on my way to work the bike started to run lean (i had just filled up)... oh great i thought im back to having a miss fire.
but turning to reserve cured the problem.
I will have a look tommorow but im sure i will find a partially blocked fuel tap.
mickwinf:
bad news.today i did a compression test,less than 50psi on cyl 4, so looks like valve trouble after all, really depressed now!
flc:
Dont be.. at least you found the problem more than half the battle.
they are good fun enjoyable bikes.
take your time and reap the rewards.
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