This is on a TRX450. When the dot on the crank gear and mark on the side cover are lined up, should the piston be at the top or somewhere in the stroke? I know this in the wrong forum, ThumperTalk takes me to ATVtalk when I go to Honda ATV's. I got this job from 3 other people who couldn't get the bike to run. I'm suspecting that the cam/crank is out of time. I have zero compression with new piston, rings ant correct valve adjustment. It will pop through the exhaust but thats it. I'm thinking the gear on the end of the crank is out of time which is throwing me off on the rest of it. The jack legs before me had the clutch in wrong, so, I'm thinking this gear is out of time. Thanks for your help, Scott.