Wiseco WK1004 Pro-Lite 2-Stroke Top End Piston Kit 69.50mm Bore +1.5mm Oversize

The Wiseco WK1004 is a Pro-Lite forged 2-stroke top end piston kit designed for the Kawasaki JS440 personal watercraft. Featuring a 69.50mm bore diameter at +1.5mm oversize, this kit delivers a displacement of approximately 455cc and is an ideal solution for cylinder overbore rebuilds on worn or damaged top ends.

Pro-Lite Forged Construction:

• Forged from high-silicon, low-expansion aluminum alloy for superior strength-to-weight ratio
• Dedicated forging design optimized for 2-stroke power delivery and service life
• CNC machined for optimal cam shape and profile for peak horsepower output
• Extra lightening operations reduce reciprocating mass for enhanced throttle response
• Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions

Kit Contents:

• Pro-Lite forged piston (69.50mm / +1.5mm oversize)
• Piston ring set (Wiseco pistons require Wiseco rings)
• Wrist pin
• Top end gasket set

Engineered and manufactured in the USA at Wiseco's facility in Mentor, OH, the WK1004 is built to deliver reliable performance whether you're refreshing a well-used watercraft or completing a full top end rebuild. The kit provides everything needed to complete the job correctly in a single purchase.

Piston part numbers included: 2084M06950 (piston) / 2736CD (ring set).