40199M09700 Wiseco Std Piston for Yamaha YZ450F 2018-2019 97mm 12.8:1 Compressio

Wiseco Std Piston 40199M09700 for Yamaha

This Wiseco Std Piston, part 40199M09700, is a 97mm forged piston rated at 12.8:1 compression, built to restore top-end power for Yamaha YZ450F models from 2018 to 2019.

Overview

This Wiseco Std Piston 40199M09700 delivers a 97mm bore at 12.8:1 compression for the Yamaha YZ450F. Riders rebuilding a 2018 or 2019 YZ450F get a forged piston made to handle high-rpm motocross use. The Wiseco Std Piston restores factory bore and compression for dependable top-end performance.

Built For Performance

• Forged aluminum construction for high strength and heat resistance
• 97mm standard bore matches the factory cylinder size
• 12.8:1 compression ratio for strong combustion and response
• Precision machined ring grooves for a consistent seal
• Designed for the demands of four-stroke motocross engines

Fits These Machines

• for Yamaha YZ450F 2018
• for Yamaha YZ450F 2019

On-The-Job Use

• Top-end rebuilds on the Yamaha YZ450F
• Motocross and closed-course racing
• Restoring compression after piston or ring wear
• Routine maintenance at rebuild intervals

Specs At A Glance

Good To Know

Q: Does this piston fit a 2018 Yamaha YZ450F? A: Yes, this piston is listed for the 2018 and 2019 Yamaha YZ450F at a 97mm standard bore with 12.8:1 compression. Confirm your engine is at standard bore before ordering.

Q: Is this piston forged or cast? A: This Wiseco piston is forged, which gives it strong resistance to heat and stress in a high-revving four-stroke. Proper clearances and ring end gaps should be set during assembly.

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