Wiseco K1172 Big Bore Forged Piston Kit Compression - 75mm 10.25 1 GPZ1100 ZX1100 KZ1100

The Wiseco K1172 is a complete 1170cc forged big bore top end piston kit designed for the 1983–1984 Kawasaki GPZ1100, GPZX1100, and KZ1100 platform. This kit takes the standard 72.50mm bore out to 75.00mm (+2.50mm oversize) at a 10.25:1 compression ratio, making it an ideal solution for engine rebuilds requiring an oversize bore or performance-focused displacement upgrade. Note: cylinder boring is required.

Kit Includes:

• 4x Wiseco 4302M07500 forged pistons — 75.00mm, 10.25:1 compression
• 4x Wiseco 2953XG piston ring sets — 75.00mm
• 4x Wiseco S555 wrist pins — 18.00mm
• 4x Wiseco CW18 18mm round wire wrist pin locks / circlips (pairs)
• 1x Wiseco W6987 MLS (multi-layer steel) head gasket
• 1x Wiseco W5496 fiber base gasket

Key Specifications:

• Wiseco Part Number: K1172
• Piston Part Number: 4302M07500
• Displacement: 1170cc
• Standard Bore: 72.50mm
• Actual Bore: 75.00mm
• Oversize: +2.50mm
• Stroke: 66.20mm
• Compression Ratio: 10.25:1
• Wrist Pin Diameter: 18.00mm

Wiseco pistons are forged from aerospace-grade aluminum alloys on state-of-the-art forging presses, delivering a superior strength-to-weight ratio over cast alternatives. Each piston features Wiseco's race-ready dome finish with smooth edges for improved combustion flow, and the ArmorGlide skirt coating reduces friction and noise while contributing to increased horsepower. Wiseco has been a trusted name in powersports performance for over 75 years, with a proven track record across Supercross, Motocross, Superbike, and drag racing.