Wiseco Std Piston Crankshaft Gasket Set for Yamaha YZ250 2002 66.40mm Bore

Wiseco Std Piston, Crankshaft and Gasket Set for Yamaha YZ250

This Wiseco standard bore rebuild kit bundles a 66.40mm piston, crankshaft, and complete gasket set for the Yamaha YZ250, giving you everything needed to refresh the top and bottom end in one box.

Overview

This Wiseco piston, crankshaft, and gasket set for Yamaha YZ250 provides a matched standard bore rebuild package for the 2002 model year. The 66.40mm piston, crankshaft, and full gasket set work together so you can restore compression and bottom end integrity in a single job. It suits riders and mechanics rebuilding a tired YZ250 engine.

Built For Performance

• Standard 66.40mm bore piston sized to the original Yamaha YZ250 cylinder
• Forged piston construction for strength under high rpm loads
• Crankshaft assembled to stock stroke and balance for the YZ250 engine
• Complete gasket set covering top end, bottom end, and covers
• Matched piston, ring, pin, and clip components in one kit

Fits These Machines

• for Yamaha YZ250 2002

On-The-Job Use

• Top end and bottom end rebuilds on a worn YZ250 engine
• Restoring compression before a race season
• Replacing a scored piston or failing crank bearing
• Workshop rebuilds where a matched kit saves sourcing time

Specs At A Glance

Good To Know

Q: Is this piston and crankshaft kit a genuine Yamaha part? A: No, this is a Wiseco rebuild kit built to fit the Yamaha YZ250, not an original Yamaha product. Always verify bore size and model year before ordering.

Q: Do I need to measure my cylinder before fitting this kit? A: Yes, a 66.40mm piston only suits a cylinder still at standard bore, so measure or have it checked first. A worn or plated cylinder may need work before the new piston fits correctly.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.