Athena P400485100039 Cylinder Kit Big Bore Stroker 112cc; Yamaha 85 YZ 85 02-18; 53mm Bore with Cylinder Head and Crankshaft included Socket Adapter The integrated shoulder protection provides

The integrated shoulder protection provides added upper body coverage

this clamp-on

engineered for performance

Since 1978

Athena P400485100039 Cylinder Kit Big Bore Stroker 112cc; Yamaha 85 YZ 85 02-18; 53mm Bore with Cylinder Head and Crankshaft included Socket Adapter The integrated shoulder protection providesMAXIMIZE YOUR RACING PERFORMANCE WITH ULTIMATE STROKER POWER Unleash the absolute maximum power, extreme low end torque, and explosive acceleration hidden within your youth 2 stroke racing engine with the Athena Big Bore Stroker Cylinder Kit (Part No. P400485100039), a premier, race proven package engineered in Italy to convert your factory setup into a high revving 112cc powerhouse. This ultimate top and bottom end overhaul features an aluminum