Well my quad died in the middle of a race sunday, I landed a jump and it was like teh key got shut off or something. I tried starting it and it sounded like it wanted to start, it would fire for a half second then die, but never run. We cleaned the carbs , checked spark, all that was fine. Then we checked compression and it blew our fingers off the plug holes, so we thought it was fine, but I got home and pulled the head off and saw a scratch so I pulled the whole jug off and found this. I also found coolant in my left pipe. I think this is why.... and I have a question... would low compression cause the gears to be really short and wind out fast?