Ok so my sled wont start or run. i had it running and while i was going i would feel a clunk from the track when i would give it full throttle, but if i gave it half throttle it wouldnt do that. decided to go home on the way home it died and will not start. i did notice that i went threw a full tank of gas. in less then 2 hrs. when trying to start it will almost start then before i give it gas it will die. Then after about 15 mins. of pulling it gets harder to pull. I have good compression and it is sparking on all three cylinders. how do i check the crank case seals. i heard these go bad often on these sleds? i am an auto mechanic and i am new to sleds please help me. thank you all for reading this and thank you for replying.