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Please help !!!!


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In the garage right now doing my first top end job on my 202 yz250f. Putting in new Wiseco piston and rings . Got the ring on the piston and tring to get the piston in the cylinder. Went into the bevel on the bottom but it is stuck and will not go in any further by hand is something wrong or what ????? Please help.

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Did you measure the ring end gap? Put the ring into the cylinder, put the bare piston into the cylinder and push up on the ring with the piston until it squares up in the cylinder. Then with a feeler gauge, measure the gap between the ends. If its too tight, that will sometimes prevent the piston from going in like you describe as well as if it is cocked sideways.

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