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Took the sled to the hills this weekend, and it ran like crap! After warming up, it barely would stay running until it got cleaned out, and on the trails it would pop and in general just complain. I noticed i burnt through A LOT of oil, at least probably 2 quarts in half a tank (or less) of gas. (as well as tons of blue smoke) Once I hit the upper rpms it seems to run relatively fine.
So any guesses? A little research has shown that maybe a seal failure on the oil pump which causes a ton of oil to be dumped into the engine. The strange part is it only seemed to do it at altitude, I rode the night before at 2000 ft and it seemed to run fine. It might just be that it is better able to deal with the increased oil if there is more air (and more fuel) to burn through it.
So any guesses? A little research has shown that maybe a seal failure on the oil pump which causes a ton of oil to be dumped into the engine. The strange part is it only seemed to do it at altitude, I rode the night before at 2000 ft and it seemed to run fine. It might just be that it is better able to deal with the increased oil if there is more air (and more fuel) to burn through it.