The Competition Kit replaces the stock ECU and includes a new throttle stop to allow wide open throttle.
This accessory affects emissions; installation on EPA-regulated 2006 or later WR models constitutes unlawful tampering except when used solely for closed-course competition.
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.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
The GYTR® Ported Cylinder Head Assembly comes fully assembled and ready to install with no costly core charges, deposits or exchange programs that can add downtime. CNC milling helps eliminate the variances that hand porting can produce. The head was developed on the flow bench in conjunction with dyno and track testing to ensure the ultimate in performance and durability. GYTR Performance Camshaft Kit is included, as well as stock valve train and cam gears for durability and easy maintenance. GYTR Head Assemblies are used by Yamaha SX/ MX and ATV Race Teams.
Note: GYTR Air Boot is recommended for the GYTR Ported Cylinder Head Kit
This oil sprayer is precision constructed out of CNC machined aluminum with a special 2-hole design. Other features include:
This easy plug-in fuel-injection and ignition tuning tool allows riders to quickly adjust the fuel and ignition maps to suit riding conditions and rider preference. Allows nine easy-to-program adjustment points for both the fuel and ignition maps. Monitor function allows user to monitor the data from various sensors on the bike as well as adjust idle timing, see engine running time, and self-diagnosis function.
Powered by two AA batteries, thus no laptop or time consuming downloads necessary. Unit does not have to be plugged into bike to create maps. Compact design can fit in the palm of your hand, pocket, etc. Memory function can save up to nine custom maps.
NOTE: Plugs right into the YZ®450F, YZ®450FX, YZ®250FX, and YZ®250F ECU. WR®450F and WR®250F requires GYTR® Competition Kit/ECU, sold separately.
Check the Specifications tab for baseline settings.
Download the GYTR Power Tuner Race Setup Log
These settings are a general starting point; many factors will affect settings, including rider preference, accessory modification, track and atmospheric conditions.
Strong pulling, mid/top. Premium Pump Gas.
Controllable low-end power. Slower revving and longer pulling. Premium Pump Gas.
Smooth power delivery. Increased control in muddy conditions. Premium Pump Gas.
Strong pulling, mid/top.
Long pulling, high revving. Premium Pump Gas.
Quick revving. Stronger pulling, mid/ top RPM.
Smooth power delivery. Controllable low RPM power with strong pulling feel/
Premium Pump Gas.
For use with GYTR Competition Kit/ECU
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