40200M09700 Wiseco Std Piston for Yamaha YZ450F 2018-2019 97mm 13.5:1 CR

Wiseco Std Piston for Yamaha YZ450F

This Wiseco standard bore piston, cross-referenced as 40200M09700, is a 97mm piston with a 13.5:1 compression ratio built for Yamaha YZ450F models from 2018 to 2019.

Overview

This Wiseco standard piston is a 97mm piston kit for the Yamaha YZ450F, referenced under part number 40200M09700. It delivers a 13.5:1 compression ratio to support strong engine response in a rebuilt or refreshed top end. It is intended for riders and engine builders servicing YZ450F models from 2018 to 2019.

Built For Performance

• Standard bore 97mm sizing for the YZ450F cylinder
• 13.5:1 compression ratio for strong power output
• Forged construction for durability under high-rpm use
• Cross-referenced as Wiseco 40200M09700 for easy verification
• Built to handle the demands of motocross competition

Fits These Machines

• for Yamaha YZ450F 2018
• for Yamaha YZ450F 2019

On-The-Job Use

• Top-end rebuilds on YZ450F motocross bikes
• Refreshing compression after extended race hours
• Standard bore piston replacement without cylinder reboring
• Track and trail use on 2018 to 2019 YZ450F models

Specs At A Glance

Good To Know

Q: Does this piston require reboring the cylinder? A: No, because it is a standard bore piston, it fits the factory 97mm cylinder size on the YZ450F without reboring.

Q: What does the 13.5:1 compression ratio mean for my bike? A: It sets how tightly the air and fuel are compressed in the cylinder, which affects power output and how the engine runs on the fuel you choose.

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