1999 Yamaha YZ 125 - bored over or not?

J

james v

New member
Hi,

I just bought a used 1999 Yamaha YZ 125 two-stroke. I am in the process of replacing the top end.

My question is: How do I know if it has been bored over or not?

The top of the piston reads: 1555E 765M05400

There is nothing else printed anywhere. I just don't know whether to buy a stock bore or .80 bored over piston.

Thanks!

James
 
Back
Top