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2005 yz250f rebuild issues

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My bike jumped time so I tore it down and pretty much replaced everything on top end I had the head redone with new valves and springs and I also got a new piston ,timing chain, and timing chain tensioner i put it together and when I turn it by hand counterclockwise it stops I think a valve is touching but I'm confused because it is timed correctly and the valves are shimed what could it be please help

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