Hello my snowmobile is backfiring at low rpm ? it only backfiring when im cruising around 20 mph after that it run very great. My engine is freshly rebuild bottom to top has only 200 miles on it. 125 psi of compression all over and the crank as been rebuild and indexed by a professional. I checked the coil and plug wire and its in the specs same for the mag. I checked my plug they are black/dark brown. I don,t know if its a problem but I have some carbon build up on my spark plug between ceramic and the cap ? I think the wire are too loose on the top of the spark plug and the spark jump out of the cap causing this carbon build up and missfire. What do think ?
99 polaris xlt sp missfire
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