Wiseco 4671M07700 77.00mm 8.6:1 Forged ATV Piston Kit .040 Oversize

The Wiseco 4671M07700 is a 77.00mm bore, .040" (1.0mm) oversize forged piston kit designed for Kawasaki 300cc ATV engines at an 8.6:1 compression ratio. This kit is a direct replacement for worn or damaged OEM pistons in engines that have been bored oversize.

Key Features:

• Forged high-silicon, low-expansion aluminum alloy construction for superior strength, reduced weight, improved heat transfer, and longer service life compared to cast alternatives
• .040" (1.0mm) oversize bore — 77.00mm diameter with a 64mm stroke for precise fitment in bored cylinders
• 8.6:1 compression ratio engineered to match OEM power characteristics
• Innovative skirt design promotes maximum horsepower and torque output
• Diamond-turned CNC finish guarantees consistent sizing and a perfect fit with no variation
• Complete kit — includes piston, rings, wrist pin, and circlips

Wiseco is the only U.S.-based manufacturer that produces powersports pistons exclusively through the forging process. Starting with aerospace-grade aluminum, the forging process compresses the material's molecular structure, aligning grain flow for enhanced impact resistance, fatigue strength, and ductility. Oversize pistons like the 4671M07700 require a professionally bored or sleeved cylinder for proper installation.

Cross-Reference: Wiseco 4671P4 | UPC: 193564125644