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My 2001 Polaris 800 xc is popping when the sled backshifts. My initial feeling is that it was lean but the plugs and piston wash look fine. The sled will not pop under any other conditions other than a backshift after at least 1/3 throttle. The gas seems fine and I have added dry gas on several occasion. I am all out of ideas and would appreciate any insight.
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Out the exaust? Mabey unburned fuel in the pipe from running a little rich at mid to high is igniting. Ever watched a stock car race after dark? Flames from the exaust going into the corners.

You have the highest vacumn possible under the described conditions. Slight leak between carbs and case? Crank seal just starting to leak?
 
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