Hi all, I have a Polaris xc sp 500. I was curious if my guess on why my sled is running rich is correct. My plugs seemed to be fouled and I was thinking maybe they were causing my sled to run rich. The sled would start good sometimes while riding and not great other times. It would also bog a little. Compression is 120 each cylinder. The sled also had an excessive amount of smoke coming out. From the exhaust. Any responses would be great!