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XR650L Popping

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I have a 2006 Honda xr650l that is in good condition and runs great. The only problem is that when it is idling down when i ride is pops and sorta backfires you could say. What would cause this?

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Initial guess is that she is running lean. Start with 1/4 turns on the fuel air mixture to richen it up a bit. Then make a run with it and see if it helps. Keep making 1/4 to 1/2 turns until the popping and back fire goes away. Just remember where your base is regarding how far you screwed it in. If this doesn't work, then you may have to go back to where you started and think about re-jetting.

Any modes done to the bike such as exhaust, air box or air filter?

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The XRL is jetted lean from the factory. "Dave's Mods"... do a search and follow the directions. 4-Strokes.com has some good info.

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Turn the fuel screw in to lean it out, turn it out to richen it up.

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Mine was doing the same thing when I first got it. I went up on the pilot jet and it never did it again.

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