Question about 1983 Honda vt 500 ft ascot

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I have a 1983 cb550sc honda that has a starting problem. when it's cold it only runs on no.1 cyl and all other exh pipes are cold. i have checked all systems and can't find the problem. compression is excellant, new plugs, timing ok. after about 2 or 3 min. of running each cyl. one at a time will start to fire. when the motor gets warmed uo bike runs fine, excellant long as the bike is warm it starts just fine. any help would greatly be appreciated. thank you for your time

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Also check the choke assemblies. One may be sticky, the other working fine. Dismantle and clean!

Posted on Dec 01, 2010

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I certainly wouldn't rule out a fuel restriction, either in tank where fuel drains to line, or line(s) to carburetors. When cold, more fuel required, plus once engine starts to run, vacuum from carbs may overcome restriction, as well as less fuel required. My guess is that heavy acceleration is a problem even when warm as well. Doesn't take long to check in tank to see if filter/screen in tank is plugged at all, as well as remove fuel line for carbs and use compressed air (carefully) to clean out line(s) as well as blow back into tank to dislodge debris at screen in tank, but if there is debris, remove tank and flush good. Any in-line filters should be replaced as well.

Posted on Aug 26, 2010


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