GYTR High Compression Piston Kit

Note: For use on 2014-2015 YZ250F models, you must replace stock oil nozzle with newer component #1SM-15155-10-00 for proper function of GYTR High Compression Piston.

This accessory is restricted to closed-course competition use. See California Regulations regarding Emission-Related Parts and Accessories for products for closed-course competition use only.

Download 2019 YZ250F Power Tuner Settings (GYTR Performance Engine)

1SM-E16A0-T0-00

• Boosts engine compression ratio to 14:1
• Includes piston rings, piston pin, and clips (uses stock replacements)

33D-E16A0-V0-00

• Two-ring design provides less drag and more horsepower than stock three-ring design
• Boosts engine compression ratio to 13.5:1

17D-E16A0-V0-00

• Two-ring design provides less drag and more horsepower than stock three-ring design
• Boosts engine compression ratio to 14.0:1

GYT-5D305-00-00
YFZ450 Application:

• Boosts engine compression ratio to 13.0:1
• 1.5 to 3 hp increase throughout most of the power band
• No crank rebalancing necessary
• GYTR Top End Gasket Kit required for installation

YFZ450R Application:

• Boosts engine compression ratio to 13.2:1
• 1.5 to 3 hp increase throughout most of the power band
• No crankshaft rebalancing necessary
• Uses stock gaskets (not included)