hey guys. i ran into a little set back. heres the story: i was racing my friend one night and we went at it. i pinned the throttle in 6th for about 10-15 second and the bike acted like it ran out of gas. i knew something was up. i slowed to a stop and tried to restart it but there was zippo compression. i took it apart and this is what i found. i was running a perfect 32:1 ratio using redline racing oil and regular 87 octane gas, the jet size is stock for the 85 250 i think its a 21 jet, i also have a powerhead on it i dont know what the dome size is or whatever. i had a head gasket blow a few weeks back and i replaced it that day. and my sister took it out with her friends and the expansion chamber came undone. i dont know how long it was ran like that. i tightened it up and ran just fine for about 30 before it lost compression.. ANY IDEAS?? im going to get it rebuilt but i dont want to have the same problem i had before..