I'm thinking now that my random compression loss may be caused by a valve bucket hanging up in it's bore. Mine is probably caused by icing, snow sucked into the breather hose and frosting up the buckets. This would explain why the bike runs better when hot, the ice melts. For you southern boys you may have sucked in some crap that caused a bucket to momentarily hang up holding a valve open. I've eliminated rings since this happens and cures itself suddenly, so that leads me to valves. My valve clearances are correct and it's not a hot valve tightening up because on the weekend it happened while I was trying to start a cold engine. I'm going to reroute my breather hose to the airbox and see if that cures the problem. You boys that had similiar compression loss, did any of you have the breather rerouted or was it factory by the peg?