Wiseco PK1078 Pro-Lite Forged Piston Kit 67.25mm 1.25mm Oversize (526M06725)

The Wiseco PK1078 is a Pro-Lite forged piston kit bored to 67.25mm (1.25mm oversize), designed as a high-performance top-end rebuild solution for 1985–86 Honda ATC250R and TRX250R two-stroke engines. Part number 526M06725 confirms the 67.25mm bore size within Wiseco's 526-series lineup for these Honda 250cc powerplants.

Key Features:

• Forged aluminum construction — produced from high-silicon, low-expansion aluminum alloy for superior strength, reduced weight, and improved heat transfer compared to cast pistons
• 1.25mm oversize bore — 67.25mm diameter, ideal for cylinders requiring a second overbore to restore proper clearances
• Diamond-turned finish — precision CNC-machined for consistent sizing and a perfect surface finish
• Complete kit — includes forged piston, rings, wrist pin, and circlips; top-end gasket set also included
• USA forged and manufactured — Wiseco forges all pistons in-house and produces its own forge tooling domestically, ensuring full quality control from raw material to finished part
• Race-proven design — developed through in-house dyno testing and R&D used across Supercross, Motocross, and GNCC competition
• Standard piston bore reference: 66.00mm (this kit is 1.25mm over standard)

Wiseco's forged grain structure is aligned to the geometry of the part, delivering higher mechanical properties and greater resistance to impact and fatigue than brittle cast alternatives. With over 70 years of piston engineering experience, Wiseco remains the benchmark for performance two-stroke rebuilds.