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Yamaha GYTR High Compression Piston Kit YZ250F/YZ450F 14-22 The GYTR® High Compression Piston Kit provides a performance boost throughout the RPM range while maintaining a high level of durability. Machined valve pockets provide additional valve clearance when used with higher lift camshafts. The kit includes piston rings, piston pin, and clips (uses stock replacements). Requires use of minimum 100-octane racing fuel. 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)
Fitments: 1SM-E1603-T0-00 YZ250F(2018, 2017, 2016, 2015, 2014) 1SM-E16A0-T1-00 YZ250F(2018, 2017, 2016, 2015, 2014) B7B-E16A0-V0-00 YZ250F(2022, 2021, 2020, 2019) B2W-E16A0-V0-00 GYT-5D305-00-00 YFZ450(2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012)
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