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03 yz 125 piston

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Alright so after years I'm finally doing a rebuild on my old race bike. Check out this piston just wondering if anyone can tell me what's going here or if this happens normally. Thanks

1406234110783.jpg

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blow by.

 

normal for a worn piston, ring, cylinder, or all.

 

Have the cylinder measured so you don't go throwing a piston kit in it only to find out the cylinder is too worn........like I just did. It will run ok for a few hours but then start loosing power quickly.

Edited by RBI

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