Wiseco K109 Forged Piston Kit Kawasaki H2 Mach IV 750 Triple 73.00mm Bore +2mm

The Wiseco K109 is a complete forged piston kit designed for the Kawasaki H2 Mach IV 750 Triple (1972–1975), featuring a 73.00mm bore — a 2mm oversize upgrade ideal for engine rebuilds and performance restoration. This is a three-piston kit, supplying all cylinders in the 750cc triple-cylinder engine.

Each piston is forged from high-silicon, low-expansion aerospace aluminum alloy, delivering superior tensile strength, reduced reciprocating weight, and improved heat transfer compared to cast alternatives. The forging process results in a denser, more consistent grain structure that extends piston service life under demanding conditions.

Key Features:

• Forged aerospace aluminum alloy construction for superior strength-to-weight ratio
• 73.00mm bore — 2mm oversize for use with bored or resleeved cylinders
• Diamond-turned CNC finish ensures precise sizing and consistent fit
• Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions
• Engineered, forged, and machined in the USA
• Kit includes three (3) forged pistons, rings, wrist pins, and circlips

Wiseco's Classic Forged Series is purpose-built for vintage and performance applications, combining decades of 2-stroke piston expertise with modern manufacturing tolerances. The K109 is a trusted choice for riders restoring or hot-rodding the iconic Kawasaki H2 triple.