605M06800 Wiseco Std Piston Kit for Yamaha YZ250 1988-1991 68.00mm

Piston Kit for Yamaha YZ250

This Wiseco standard piston kit, part 605M06800, is a 68.00 mm piston assembly that restores factory compression and top-end performance to your two-stroke engine.

Overview

This piston kit for Yamaha YZ250 is a standard bore replacement designed to refresh a worn top end. It uses a 68.00 mm standard diameter to match the original cylinder bore without machining. Riders and mechanics rebuilding a YZ250 top end will find this piston kit a direct-fit solution for their rebuild.

Built For Performance

• Forged aluminum construction for high strength under combustion loads
• 68.00 mm standard bore diameter
• Kit includes piston, rings, pin, and circlips for a complete rebuild
• Designed to restore compression and top-end power
• Precision machined skirt for consistent cylinder wall contact
• Heat-treated for durability in high-rpm two-stroke operation

Fits These Machines

• for Yamaha YZ250 1988-1991

On-The-Job Use

• Top-end rebuilds after piston wear or seizure
• Standard bore cylinder refresh without machining
• Motocross and off-road racing maintenance
• Restoring compression on high-hour engines

Specs At A Glance

Good To Know

Q: Does this kit include everything needed for a top-end rebuild? A: Yes, it comes with the piston, rings, wrist pin, and circlips. Gaskets and bearings are typically sold separately.

Q: Will this piston fit an oversize cylinder? A: No, this is a standard bore piston requiring a cylinder at 68.00 mm. Confirm your cylinder's current bore before ordering.

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