Wiseco PK1695 68mm 2-Stroke Top End Piston Kit for YZ/WR250

The Wiseco PK1695 is a complete 2-stroke top end piston kit designed for the 1988–1991 Yamaha YZ250 and WR250. Featuring a 68mm (605M) bore diameter, this kit provides everything needed for a proper top end overhaul or overbore rebuild in a single convenient package.

Kit Includes:

• Forged high-silicon aluminum alloy piston
• Piston ring(s)
• Wrist pin (alloy)
• Circlips
• Top end gasket set

Key Features:

• Forged construction — forged from high-silicon, low-expansion aluminum alloy for superior strength, reduced weight, improved heat transfer, and longer service life
• E-coated piston crown, ring grooves, and pin bore for maximum wear resistance and protection against micro-welding, galling, and detonation
• Dedicated forgings with optimized strength-to-weight ratio using aerospace-grade alloy
• Engineered, forged, and machined in the USA at Wiseco's Mentor, Ohio facility
• Race-proven design trusted by top teams in Supercross, Motocross, and GNCC competition

Wiseco is the only aftermarket piston manufacturer in the United States that produces pistons exclusively using the forging process, with all forge tooling made in-house. This allows full control of every manufacturing step — from raw bar stock to finished skirt coating — ensuring consistent quality and precise tolerances for every kit.