Hi...XR650L Before dissembling motor I checked compression and got a reading 30... 60... and one time 90... So thought I bent valves. Took it apart and did a leak test with head upside down and it seems fine. I was driving real slow in first gear when it jumped and it almost started with 170degree jump. Do i have to take valves off or the leak test is enough? Think my compression tester is messed up, its those rubber tips you push instead of threads. When I push on it maybe the tip closes, works fine on my skidoo but ATV plug's smaller.