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how do you tell if rod and bearing or other things in bottem end are bad

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never done a bottem end before i just took off the cylinder and head and im going to put new valves in. iits an 05 crf 250 r. The piston looked fine so im not replacing that. it wouldnt start when got it and when i kicked it it did seem to lock up sometimes when i tried to kick it. any advise would help or any question for me to help you asses the prop. i know the valves are a reason why it didnt start but i would like to make sure the bottem end is ok and not ruin the cylinder or something

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If the rod moves at all up and down the rod bearing is junk, side to side is ok. You should not be able to feel any play in the crank bearings.

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