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Message: [QUOTE="zcookie49, post: 270323, member: 21043"] A friend of mine has recently had a new piston and rings installed in his 99YZ400F. seriously, not mine , a friend.... Anyhow, he had a friend do the job. Needless to say, once he installed motor back into the bike and put back together, when you go to kick the bike, there is no compression.... He has probably torn it down 4 - 5 times, readjusted the cams and chain, apparently having all lined up with tension, reinstall, and no compression. Now he is pretty much finished with messing with it..probably going to take to a shop to finalize I thought that before he did that, I could post a thread here and see if anyone has some suggestions toward this. Would appreciate any help here. Thanks.... [/QUOTE]