Wiseco R1075 Forged Piston Kit Kawasaki CR - Z1 KZ900 KZ1000 10.25 1

The Wiseco R1075 is a complete forged piston kit engineered for Kawasaki Z1, KZ900, and KZ1000 engines. Designed for both high-performance racing builds and demanding street applications, this kit delivers the precision and durability that Wiseco is known for throughout the powersports and racing industry.

This kit overbores to a 72.00mm actual bore (2.0mm over standard 70.00mm), resulting in a displacement increase to 1,044cc with a 10.25:1 compression ratio and a 66.00mm stroke. Each piston is forged from high-silicon, low-expansion aluminum alloy, offering superior strength, reduced reciprocating weight, and improved heat transfer compared to cast pistons.

Key Features:

• Forged aluminum construction — high-silicon, low-expansion alloy for superior strength and longevity
• 72.00mm actual bore — 2.0mm oversize from standard 70.00mm
• 10.25:1 compression ratio — optimized for performance rebuilds
• 1,044cc displacement at 66.00mm stroke
• Diamond-turned CNC finish — ensures precise sizing with no variation, compatible with cast iron, chrome, nikasil, and boron composite cylinder bores
• 17mm wrist pin (S523 — 17mm x 2.429 in.) included
• Compatible with a wide range of oversize and replacement cylinder sleeves for maximum versatility

Kit Includes:

• Ring sets — 2835XC 72.00mm ring set
• 17mm wrist pins (S523)
• Round wire pin locks / circlips (CW17, 17mm, pairs)
• Base gasket — W5380 (.020 fiber, Kawasaki 1000–1200)
• Head gasket — W6967 (MLS .040, fits Kawasaki 1075–1135)

Wiseco part numbers included in this kit: 4052M07200 (piston), 2835XC (ring set), S523 (wrist pin), CW17 (pin locks), W5380 (base gasket), W6967 (head gasket). Cross-reference part numbers: K1075, K1075-1, K10751.