40254M09700 Wiseco Std Piston Kit for Yamaha WR450F 2021-2023 97mm 13:1 CR

Standard Piston Kit for Yamaha WR450F

This Wiseco standard piston kit for Yamaha WR450F delivers 97mm bore diameter with a 13:1 high compression ratio, featuring the OEM cross-reference 40254M09700 for direct fitment on 2021-2023 models.

Overview

This standard piston kit for Yamaha WR450F is a high-compression forged piston assembly engineered for 2021-2023 models. The 13:1 compression ratio piston kit for Yamaha WR450F restores top-end power and throttle response after a rebuild. Ideal for riders and mechanics performing routine top-end service or performance refresh on the WR450F.

Built For Performance

• 97mm standard bore diameter matches OEM cylinder specifications without overboring
• 13:1 high compression ratio increases combustion pressure for stronger power output
• Forged piston construction offers superior strength compared to cast alternatives
• Wiseco part number 40254M09700 and OEM cross-reference ensure correct fitment
• Complete kit includes piston, rings, wrist pin, and circlips for a full top-end rebuild
• Designed specifically for 2021-2023 Yamaha WR450F engine architecture

Fits These Machines

• for Yamaha WR450F 2021
• for Yamaha WR450F 2022
• for Yamaha WR450F 2023

On-The-Job Use

• Top-end rebuilds after piston wear or ring fatigue
• Motocross and enduro racing engine refreshes
• Trail riding maintenance on high-hour engines
• Performance rebuilds seeking higher compression

Specs At A Glance

Good To Know

Q: Does this kit include rings and wrist pin? A: Yes, this Wiseco piston kit ships as a complete assembly with piston, rings, wrist pin, and circlips for a full top-end install. Confirm your cylinder bore is within spec before ordering.

Q: Do I need to reflash the ECU for the higher compression? A: A 13:1 ratio may require premium fuel and, in some cases, ECU tuning to avoid detonation. Consult your tuner for your specific build.

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