Ring Gap

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12/20/2017 6:13 AM
Edited Date/Time: 12/22/2017 9:48 AM

A friend bought a 03 YZ125 and is installing a fresh oem piston. The piston coming out of the YZ has a .006 gap which sounds way tight to me. Minimum Yamaha specs is .020. What is acceptable?


12/21/2017 5:01 AM

This is from my 2002 YZ125 manual. I assume the 2003 would be the same.Photo


12/21/2017 5:42 AM

If you are running a stock piston then go by the factory specs. If you are running an aftermarket piston go by their specs.