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hey im having some problems fixing my buddies sled. he let his boss use it pulling a nordic ski trail thing? it over heated and never started again i took it and did an entire top end rebuild because coolant was getting into the case. there are no cracks in the head or cylinders that i can see and it seems to be sealing under the head and jugs fine. i tried cleaning out the crank, i didn't put coolant back in it to see if it would start still no luck. it has compression the carbs seem fine. i don't know what else to do besides replace the stator but im still getting spark, so i don't think thats the problem. many the cdi or coil? if anyone else has had this problem please help im out of ideas. thanks