Wiseco R1109 Forged Piston Kit Compression - 78mm 12 1 1109cc 4-Stroke

The Wiseco R1109 is a complete forged piston kit designed for the Suzuki GSX-R1100 (1986–1988), delivering a 78.00mm bore, 12:1 compression ratio, and a total displacement of 1109cc. Built for high-performance 4-valve, 4-stroke applications, this kit is engineered to outperform OEM cast pistons in both strength and longevity.

Key Features:

• Aerospace-grade forged aluminum construction — the forging process compresses molecular structure, increases density, and aligns grain flow for superior resistance to impact and fatigue
• 78.00mm bore diameter with a 12:1 compression ratio optimized for maximum power output
• Application-specific piston design — engineered with proper installed clearance to maximize power, minimize wear, and ensure an optimal cylinder seal at operating temperature
• CNC diamond-turned finish for precise sizing and compatibility with cast iron, chrome, Nikasil, and boron composite cylinder bore surfaces
• 3D design and finite element modeling used in development to ensure the highest strength-to-weight ratio for each specific application
• Compatible with oversize cylinder sleeves — ideal for engine rebuilds and performance upgrades on chrome, Nikasil, and boron composite cylinders

Kit Includes:

• 4x Forged pistons (Wiseco P/N 4435M07800)
• Piston rings
• Wrist pins (piston pins)
• Circlips
• Head gasket

The Wiseco R1109 piston kit is the trusted choice for racers and performance enthusiasts rebuilding or upgrading the Suzuki GSX-R1100 engine. Wiseco's exclusive forging process — used across all of their powersports pistons — provides a tougher, more durable alternative to cast pistons, making this kit equally suitable for drag racing, track use, and high-performance street riding.