Question about 2003 Yamaha V Star 1100 Custom

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Shifting up or down, my forward piston backfires.

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Popping from the exhausts is common on V stars. It is usually caused by an air leak at the exhaust header. So check this by either check tightening the bolts & using a piece of hose(about 500mm long),one end in your ear, the other at the header(where it bolts to the head). Listen for exhaust leaks. If you hear any replace the header gaskets.A customer of mine very recently fitted 2 gaskets to stop his bike poping after fitting aftermarket pipes. If all this checks OK.Use the hose again to listen for air leaks at the carby inlet manifolds. Air leaks hear cause a lean mixture & can cause backfireing. Also backfireing can be caused by carburettor imbalance.
Hope this helps
Regards Andy

Posted on Jul 15, 2010

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