Wiseco K1135 1135cc Big Bore Forged Piston Kit with Sleeves for Kawasaki Z1 / KZ900 / KZ1000

The Wiseco K1135 is a 1135cc big bore forged piston kit designed for Kawasaki Z1, KZ900, and KZ1000 street and strip applications. This complete top-end kit delivers a significant displacement upgrade with a 74mm bore and 10.25:1 compression ratio, making it an ideal choice for performance builds and drag applications.

Kit Includes:

• 4x Wiseco 4052M07400 forged pistons — 74mm bore, 10.25:1 compression ratio
• 4x Wiseco 2913XC 74.00mm piston ring sets
• 4x Wiseco S523 17.00mm wrist pins
• 4x Wiseco CW17 17mm round wire wrist pin locks / circlips (pairs)
• Cylinder sleeves
• Wiseco W3918 CFM20 head gasket
• Wiseco W5380 fiber base gasket

Forged Construction:

All Wiseco pistons are forged from high-silicon, low-expansion aluminum alloy, delivering superior strength and reduced weight compared to cast alternatives. The forged process improves heat transfer and extends service life under high-performance and racing conditions.

Precision CNC Manufacturing:

Each piston receives a diamond-turned finish from CNC turning centers, ensuring consistent sizing and a precision fit. Wiseco pistons are compatible with all modern cylinder bore compositions including cast iron, chrome, Nikasil, and boron composite liners.

Oversize / Big Bore Design:

The K1135 utilizes replacement cylinder sleeves, allowing builders to bring worn or damaged cylinders back to spec while simultaneously increasing displacement. This makes it a practical upgrade for both restoration and performance builds.

Wiseco has been a trusted name in performance pistons for over 75 years, competing at the highest levels of motorsport including Supercross, Motocross, Superbike, and NHRA Pro Stock racing.