Wiseco 519M05400 2-Stroke Forged Series Piston Kit 54.00mm Bore

The Wiseco 2-Stroke Forged Series Piston Kit delivers the performance and durability that Wiseco has built its reputation on since 1941. Engineered specifically for the Suzuki RM125, this standard-bore kit features a forged 4032-alloy piston measuring 53.95mm in diameter (54.00mm bore) and comes complete with a matched ring set, wrist pin, and circlips — everything needed for a proper rebuild. Wiseco's 2-stroke piston heritage spans over eight decades, and each kit reflects that depth of experience through purpose-built design and precision American manufacturing.

Key Features:

• Forged 4032-alloy piston engineered and machined in the USA in Mentor, OH
• Designed specifically for each 2-stroke powersports engine application — not a generic fitment
• Improved tensile strength of forged material for optimized durability and service life
• Dedicated forgings with additional lightening operations deliver an optimized strength-to-weight ratio
• Kit includes ring set (2126CD), wrist pin (S485), and circlips (CW14) — complete and ready to install
• Standard bore: 54.00mm cylinder bore diameter / 53.95mm piston outside diameter
• Piston oversize: STD (0mm oversize)

This kit is a direct-fit solution for select 1985–1986 Suzuki models. Note: California residents — this product is subject to Prop 65 warnings for cancer and reproductive harm.