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Two years ago, the sled cracked a cylinder skirt, at the time I just assumed that it was due in part to that, that I would lose a cylinder at idle. Last year, I rebuilt the engine with wiseco pistons, decked the heads .02", ported the exhaust ports, but didn't do any bottom end work. I didn't know how to do any jetting work, so I sent the whole sled in after the rebuild. One week later I got the sled back and after on the trail, I realized that the engine was running too rich and it still dropped a cylinder at idle, yet ran fine above 1600 rpm's. It went back to the shop for re-jetting, and check out the idle issue. "It needs a carburetor" is what i got told, so I put a carb in it along with two new needles and seats, and choke plungers with no positive result...what do you guys think?
Any help would be much appreciated, thank you.
 

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check fuel pump for pin hole leak causing raw gas to be pulled into the crankcase with the pulse pipe and causing cylinder to run rich
 
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