Big Bore (81mm.) 1st. Oversize Piston Kit – for 750 Engine Kit for Yamaha XS650’s. One Forged Piston, 1 Ring set, 1 piston Pin, 1 set of rings for one piston.

Features: Valve pockets cut for large valves, 2. Mos2 treated piston skirts.

3. Oil chanel for enhanced pin oiling. 3. 20mm.piston pins that are internally

tapered for lighter weight. Piston weight approx 455 Grams.

One Big Bore needs two Kits of Piston .

Part #05-0753 $83.95 /Kit