Hey lads hard weekend on the sled put about 200 kms on it and about 3/4 threw the drive she was bogging like a plug was starting to fowl high rom it would run good low rom it was spitting and bogging when I pulled plug there was a bit of piston on it so I limped it to the truck weird thing is plug wasn't white I sprayed brake cleaner on my crank seal it didn't mess the rpms up could bad gas be the factor or snow dust ??? I'll take picks when I pull it apart but the piston is melted at the exhaust port from what I can see with a light in the plug hole