My '84 Yamaha Virago xv700 runs on prime, skips and misses on "on".?

S

Snowdog

New member
It seems my Virago has had an issue where it will intermittently run on one cyclinder. I've replaced the petcock (new oldstock OEM), replaced many of the fuel and vacuum lines and just recently pulled and rebuilded the carburetors.
It will start up fine now (thanks to last year's starter-grind fix), but it will still, on occasion, run on one cyclinder. This will sometimes work itself out, but I suspect it does this less when on the prime position. However, I'm not entirely convinced it's a fuel issue.

Has anyone ever had a bike that would sometimes run on only one cylinder that was fixed by replacing the ignition wires, coils, etc.

Thank in advance!
 
the old viragos have a black plastic "mixture control valve" that acts as a big vacuum leak & causes one cylinder to misfire at low rpm when its not working right.
one of you're manifolds ( I think its the front one) will have an extra vacuum line going to this valve.
just block this extra hose nipple at the manifold & see if it helps.
the bike will run better without this mixture control valve hooked up. its just some kind of anti pollution crap any way.
 
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