Wiseco Std Piston Crankshaft Gasket Set for Yamaha YZ250 66.40mm Bore 1999-2000

Wiseco Std Piston/Crankshaft/Gasket Set for Yamaha YZ250

This Wiseco standard piston, crankshaft, and gasket set is a complete engine rebuild kit for the Yamaha YZ250 with a 66.40mm bore.

Overview

This Wiseco rebuild set delivers a standard bore piston, crankshaft, and full gasket kit for the Yamaha YZ250. It restores compression and bottom end strength on a tired two stroke engine with matched components. This piston, crankshaft, and gasket set suits riders and mechanics doing a full engine refresh.

Built For Performance

• Standard 66.40mm bore piston sized for stock cylinder dimensions
• Crankshaft built to handle high rpm two stroke loads
• Complete gasket set included for a full rebuild
• Matched piston and crankshaft combination for balanced operation
• Components designed for motocross and off road duty cycles

Fits These Machines

• for Yamaha YZ250 1999
• for Yamaha YZ250 2000

On-The-Job Use

• Top end and bottom end rebuilds on worn two stroke engines
• Motocross track and trail riding maintenance
• Restoring compression on high hour machines
• Shop and home garage engine builds

Specs At A Glance

Good To Know

Q: Does this kit fit a stock cylinder? A: Yes, the 66.40mm bore matches the standard cylinder size for the listed YZ250 model years.

Q: Is machining required for installation? A: No, standard bore components are designed to drop into a stock cylinder in good condition, though clearance checks are recommended before assembly.

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