ITEM DESCRIPTION: NOS Yamaha Piston, 1st OS (.25mm). Yamaha Part # 137-11635-61-00, 372-11635-09-00.
 
NOTE: This is the later style which uses Keystone type rings. I have the early style in another listing.
 
Fits These Yamaha Models:
  
Yamaha Motorcycle 1965 YA6 CRANK & PISTON
Yamaha Motorcycle 1966 YA6 CRANK & PISTON
Yamaha Motorcycle 1966 YA6B CRANK & PISTON
Yamaha Motorcycle 1964 YA6 CRANK & PISTON