XR650R Backfiring

2 replies to this topic
  • Scoobie

Posted October 15, 2005 - 06:50 AM



Just given the above a major service - new plug, valve clearances etc. At the same time removed an IMS tank and put a rubber pipe from the now defunct vacuum take-off and plugged the other end with a bolt.

However, the bike now starts but backfires when idling and when I close the throttle. It didn't before.

Any suggestions?



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  • kehale

Posted October 15, 2005 - 07:48 AM


sounds like a vacuum leak.

If that's all you did, then it's probably something you changed or did.

you can use the smoke test to see if you have a vacuum leak at one of those connections. I always have to borrow a cigarette, as I don't smoke, but it works pretty good. You'll see the smoke get sucked in the vacuum leak when you find it.

  • miguelitro

Posted October 15, 2005 - 08:42 AM


or carb cleaner sprayed around the area will cause the revs to rise if it enters the intake.
Gotta think on this one a little more though as my bike is apart right now and has to be back together tonight to race tommorrow, better hit the garage, good luck.

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