653M04000 Wiseco Std Piston Kit for Yamaha PW50 1981-2024 40.00 mm

Wiseco Std Piston Kit for Yamaha PW50

This Wiseco Std piston kit for Yamaha PW50 models is a 40.00 mm standard bore piston assembly that restores compression and top-end power on worn two-stroke minibike engines, cross-referencing OEM part 653M04000.

Overview

This Wiseco Std piston kit for Yamaha PW50 models is a standard bore replacement piston assembly for tired top ends. The 40.00 mm piston restores compression and performance without changing the original cylinder bore size. It suits riders and mechanics handling a straightforward top-end rebuild.

Built For Performance

• Forged piston construction for strength under two-stroke combustion loads
• Standard bore size keeps the original cylinder dimensions unchanged
• 40.00 mm piston diameter matches the factory bore specification
• Designed as a direct-fit replacement for the stock piston assembly
• Kit includes piston and components needed for top-end reassembly

Fits These Machines

• for Yamaha PW50, 1981-2024

On-The-Job Use

• Top-end rebuilds on PW50 minibikes
• Restoring compression after normal two-stroke wear
• Refreshing engines that have experienced piston scoring
• Routine maintenance on older machines still in regular use

Specs At A Glance

Good To Know

Q: Does this kit require machine work on the cylinder? A: No, a standard bore piston is intended for a cylinder that still measures within factory specification and needs only honing.

Q: Can I install this piston without checking ring end gap? A: No, ring end gap should always be measured and set to specification before final assembly for reliable sealing.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.