Question about 2001 Yamaha V Star 1100 Classic

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Engine backfire I own a 1999 Yamaha V Star 1100 Classic. It has Cobra pipes on it and backfires like crazy! I've adjusted the emission tube on the left side of the bike and turned it into itself and put a golf tee in the other end. That helped for a while, but now it backfires worse than ever (during warmup, while shifting, and deceleration). The jets in the carb. have not been changed. Is that part of the problem?

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  • Anonymous Jan 20, 2009

    I am having a similar problem. Beyond the typical cack,cack,cack, I get a really loud POW!. I know that I am getting afterburn, as I can see flame out the tail pipe from the front exhaust, is that all it could be? If so, how can I correct the problem?

  • johnnymav Jan 20, 2009

    I have a '99 star as well. I have the normal cack,cack,cack on decel, but I also get this really loud POW! intermittently. I thought it might be afterburn, as I am getting a flame out the pipe from the front exhaust port, but this happens on a soft decel and even at idle(although not as loud).

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Try pulling the choke out a little and see if that doesn't help.  If it does that is a sign that you are running too lean and need the jets in the carb increased or just the air mixture screw adjusted.  If the coke test doesn't help, please tell me more about how and when it acts up. Like after the motor is warmed up does the backfiring quit?

Posted on Jan 03, 2009

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Yamaha vstar 1100 back fireing


Re-jetting the carbs may be needed.
Imbalance of air/gas ratio will cause backfiring among many other things. :)

Other considerations:
Have the timing and valves set.

After market pipes will also increase the Poping sound when you let off the throttle. (not really backfiring but annoying)
Removing and plugging the AIS system will stop most of this.

Good luck!
Hope this helps.

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YOU ARE NOT BURNING ALL THE FUEL IN THE CYLINDER HTE FUEL THAT ISNT BURNT GOES IN THE EXHAUST AND WHEN YOU DEACCELERATE IT WILL BACK FIRE SO THERE IS TO MUCH FUEL GOING INTO THE CYLINDER ON CARB THERE ARE 2 SCREWS 1 FOR IDLE AND 1 FOR MIXTURE ADJUST THE MIXTURE ONE SCREW IT IN 1/4 OF TURN AND TRY IT

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