Question about 2004 Yamaha V Star 1100 Classic

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Have a 2004 yamaha classic changed to K& D pipes ran fine then 2 years ago after an oil change it started backfiring on deceleration and has gotten worse...have spent over 7 hundred dollars and no one has fixed it yet....what can be causing the problem

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Well - the front pipe has to be removed to change the oil filter on this bike, so it's very likely that when reinstalled the mechanic did not get it back in place correctly. Couple that with the likelyhood that he re-used the old exhaust gasket and this is your most likely cause for the backfire - a simple exhaust leak. Other typical causes for exhaust backfires are insufficient valve clearance, burnt valves or incorrectly adjusted carbs. In my experience the most common cause for exhaust backfire is a leak in the exhaust circuit which can draw in fresh air during decelleration.

Posted on Nov 15, 2010

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When they do an oil change they have to unbolt the exhaust system to change the oil filter. Put in new gaskets where the head pipe of the exhaust system goes into the head . lf there are are other gaskets in the system replace them too. That should take care of your popping problem.

Posted on Nov 15, 2010

  • babe0329 Nov 15, 2010

    we just replaced the gaskets and everything to do the intake boot clamps...it got worse...unless the guy didn't know what he was doing......but thank you for the advice I have been told it's everything from the mixture being to rich to needing a jet pack to rewrapping the baffles.......

  • David Belcher
    David Belcher Nov 15, 2010

    Did they remove the old gaskets. sometimes they get doubled up and that can make it worse. If you can match up the exhaust gasket to a Honda copper exhaust crush washer you might give that a try. Did you try replacing the spark plug caps? NGK caps just screw on the end of the wire and can mess up the running at different speeds. The old cap should ohm out to 5000 OHMs , anything higher or lower and you replace them. It is simple and stupid but sometimes that is the fix.

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