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KX65 New Piston Issues

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Hello - I just installed a new Wiseco stock piston (44.50mm) in my son's 2000 KX65. I tried rotating the crank and noticed that the bottom of the piston hits the top of the case and jams. It won't complete a full revolution. I double checked the piston and it is the correct one for the bike. I threw out the old piston so I can't compare what was in it before. Any thoughts what is going on?

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