Wiseco Pistons 602M07700 Forged Piston Kit Standard Bore - 77mm 633cc 2-Stroke

The Wiseco 602M07700 is a forged piston kit designed for Yamaha 650cc 2-stroke personal watercraft engines at the standard 77mm bore size. Built to Wiseco's exacting performance standards, this piston kit delivers the superior strength, durability, and precision fitment that Wiseco is known for in the powersports industry.

Key Features:

• Forged High-Silicon Aluminum Construction — Wiseco pistons are forged from high-silicon, low-expansion aluminum alloy for superior strength, reduced weight, improved heat transfer, and extended service life compared to cast alternatives.
• Diamond-Turned CNC Finish — Each piston receives a precision diamond-turned finish from CNC turning centers, ensuring consistent sizing and a perfect bore fit with no size variation.
• Multi-Cylinder Compatibility — Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions, making this piston suitable for both stock and rebuilt engines.
• Oversize Options Available — Part of a full range of oversize pistons (available in 0.5mm increments) designed to restore worn cylinder bores and extend engine life.
• Standard Bore Size: 77.00mm (Standard / Stock)
• Displacement: 633cc
• Engine Type: 2-Stroke

Kit Includes:

• 1 Forged piston
• 1 Ring set
• 1 Wrist pin
• 2 Circlips

Top-end bearings, gaskets, and cylinder sleeves are not included unless otherwise noted. Wiseco piston kits are sold by application and bore size — always verify your standard bore measurement before ordering to ensure you select the correct standard or oversize kit for your engine.