Piston and rings

Yamaha YZ 125 discussion forum:


Piston and rings

Piston and rings 
Gary Woz said 2021-12-22 17:14 
 
I just bought a 1979 yz125 and it has new piston and rings it runs great but it feels like it has little compression when kicking over. The bike fires right up and has lots of power . I measured the cylinder bore and it is 56.8 and was wondering do I get piston and rings or just rings and what size ? 56.5 or 56.75 ? 
 
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