Wiseco PK1696 Pro-Lite Top End Piston Kit Bore - 2-Stroke 68.5mm

The Wiseco PK1696 Pro-Lite Top End Piston Kit is a complete rebuild solution for 1988–1991 Yamaha YZ250 and WR250 two-stroke engines, featuring a 68.5mm bore (605M forging). This kit contains every component needed to oversize or fully rebuild the top end in a single purchase, eliminating the guesswork of sourcing individual parts.

Key Features:

• Forged Pro-Lite piston manufactured from high-silicon, low-expansion aerospace aluminum alloy for a superior strength-to-weight ratio
• 68.5mm bore diameter using Wiseco's 605M dedicated forging for a precise, application-specific fit
• E-coated crown, ring grooves, and pin bore for maximum wear resistance and protection against micro-welding, galling, and detonation
• High-performance ring set for extended service life and sustained power output
• Alloy wrist pin and circlips included for a complete, ready-to-install assembly
• Complete top end gasket kit included — everything needed to finish the rebuild without additional purchases
• Wiseco Pro-Lite 2-stroke pistons are engineered from decades of racing experience and chosen by top-level motocross and off-road race teams

All Wiseco pistons are forged in-house at their Mentor, Ohio facility, with full control over every stage of manufacturing from raw material to finished, skirt-coated part. The result is a piston engineered to deliver consistent performance and durability across all riding conditions — from weekend trail riding to competitive racing.