hey guys. i HAVE A KX 85 2003. My problem is well i m not sure but i was riding earlier and all of a sudden the back tire locked up and the bike started squeeking and then it came to a stop when i tried to kick it over again all i could hear was a squeeking noise coming from the motor but when i took the spark plug off there was no squeeky noise but still it did not start.I m getting compression but it wont start so beiing that when the spark plug was off it didnt make the noise i m thinking that possibly a air leak some where. PLEASE HELP ME OUIT GUYS I WAS JUST TOLD THAT A NEW ENGINE CAN COST FROM 1000 to 1200 DOLLARS I DOTN HAVE THAT MOINEY.