Item description for Yamaha Piston GYT Racing? .25mm 1st OS, NOS 1965-66 YDS3, 156-11635-00

ITEM DESCRIPTION: Yamaha Piston .25mm (1st OS). Yamaha Part # 156-11635-00-00.

NOTE: I believe this is a super rare GYT (Genuine Yamaha Tuning) piston which has an exhaust port relief cut into the piston for high RPM power.

Fits these Yamaha Models:

Yamaha Motorcycle 1966 YDS3C CRANK AND PISTON

Yamaha Motorcycle 1965 YDS3 CRANK AND PISTON

Yamaha Motorcycle 1965 YDS3C CRANK AND PISTON