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650R popping

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I just picked up an 03 650R. It is stock except for a Big Gun slip-on exhaust. The bike runs great except when you let off the throttle it pops alot. Is this a jetting issue or do i have another problem. Any help would be great.

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This is the dreaded Air Cutoff Valve rearing its ugly head.

Go up to the FAQs at the top of the forum and look at the "Carb Fix" page for the XR650R. It will tell you why your XR is doing what it is doing and how to fix it very easily.

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Well, if the bike was originally sold in CA, it has the air induction exhaust and that is known for causing a really bad pop, but it's normal.

There is a lot of good info at http://www.xr650r.us/

If the bike is totally stock, except the exhaust, I would really look into uncorking it. But, in CA you may have "green sticker" problems after that since it will be much louder, and may produce more emissions.

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This is the dreaded Air Cutoff Valve rearing its ugly head.

Go up to the FAQs at the top of the forum and look at the "Carb Fix" page for the XR650R. It will tell you why your XR is doing what it is doing and how to fix it very easily.

+1 check you pj size sounds like you need a 68s pj just my 0.02

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