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RMZ- 250 2008 engine rebuild

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recently rebult the engine ony rmz-250 after it cracked my crankcase, after rebuilding the kickstart goes really stiff as it was before if cracked, so the only way of starting it to bumpstart the bike, once it is running it runs a treat. has anyone had this problem before and is it just the kickstart that is causing this?

cheers Ben

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Take the spark plug out and see if it kicks over freely. I'd be looking at engine timing,can chain,can tensioner,valves-if they are bent. Also make sure the cam bridges aren't seizing. Cams should move freely after tightening bridge. If it binds cams-something is wrong. It could be a lot of things,but the bike should kick start without issue. Definitely check the a kick start mechanism and associated gears.

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