PK1401 Wiseco Std Piston Gasket Set 12.5:1 for Yamaha YZ250F 2005-2007

Wiseco Std Piston Kit for Yamaha YZ250F

This Wiseco standard bore piston kit with gasket set (PK1401) is built for the Yamaha YZ250F, offering a 12.5:1 compression ratio for strong four-stroke performance.

Overview

This Wiseco standard piston kit for the Yamaha YZ250F includes the piston and gasket set needed for a top end rebuild. The standard bore sizing maintains factory cylinder dimensions while the 12.5:1 compression ratio supports strong four-stroke power delivery. It suits riders and mechanics refreshing a YZ250F engine for track or trail use.

Built For Performance

• Wiseco forged piston construction for durability under four-stroke loads
• Standard bore sizing for use with a stock or stock-spec cylinder
• 12.5:1 compression ratio for strong combustion performance
• Includes gasket set for a complete top end seal
• Kit referenced as PK1401 for easy cross-checking

Fits These Machines

• for Yamaha YZ250F 2005
• for Yamaha YZ250F 2006
• for Yamaha YZ250F 2007

On-The-Job Use

• Top end rebuild after piston wear or compression loss
• Refreshing a high-hour four-stroke motocross engine
• Routine maintenance on the YZ250F platform
• Shop and DIY engine rebuild projects

Specs At A Glance

Good To Know

Q: Does this piston kit require cylinder machining? A: No, a standard bore piston is intended for use with a cylinder already at stock dimensions, though the bore should be checked for wear before installation.

Q: Is this an original Yamaha part? A: No, this is an aftermarket Wiseco piston kit designed for the Yamaha YZ250F and is not an original equipment part.

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