Wiseco Pistons PK1838 Top End Piston Kit for Suzuki - 53.0mm RM85

The Wiseco PK1838 is a complete top end piston kit engineered for the Suzuki RM85, featuring a 53.0mm bore diameter (806ML) — a 5mm overbore over the stock 48mm specification. Designed as a direct-fit solution for top end overhaul or cylinder reboring, this kit delivers everything needed to complete a full rebuild in a single package.

Wiseco's two-stroke piston kits are forged from high-silicon aluminum bar stock, offering superior strength, reduced weight, improved heat dissipation, and longer service life compared to OEM cast pistons. Each piston features dedicated forgings developed specifically for the application, ensuring an optimized strength-to-weight ratio and precision fit to the cylinder bore.

Kit Includes:

• Forged high-performance piston (53.0mm bore)
• Piston rings
• Alloy wrist pin
• Circlips (wrist pin locks)
• Top end gasket set
• Top end bearing (for 2-stroke application)

Key Features:

• Forged from high-silicon, low-expansion aluminum for superior strength and durability
• Engineered, forged, and machined in the USA
• Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions
• Race-proven design trusted by top teams in Supercross, Motocross, and GNCC competition
• Oversize bore — cylinder boring required prior to installation

The Wiseco PK1838 is a performance upgrade over stock, providing a durable and reliable solution for riders looking to restore or increase the displacement of their Suzuki RM85 two-stroke engine.