03 yz 125 piston

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

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

Normal. Godspeed on your rebuild.

 

 

By normal...i mean...normally worn out.

Thanks for the help guys

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