Yamaha GYTR Competition Kit For WR250F
Company: Yamaha
Price: 107.05
- Low price and easily the single best mod for a WR250F.
- Makes your WR a race bike, yet still reliable.
- Plug and play or play with it more through the GYTR Power Tuner.
- Careful with the wiring connections.
- You need the Power Tuner to really take advantage of this ECU.
What it is
- The easy way to make the Yamaha WR250F a competition bike.
A competition ECU and throttle stop screw that replaces the standard ECU and metered throttle stop screw on the Yamaha WR250F to allow it to allow full competition setting. This is a plug and play and replaces the mapping that is EPA emissions and sound compliant with one that is tuned to run as a closed course competition race setting. It also allows the use of the GYTR Power Tuner (sold separately $279.95) to make tuning adjustments to fuel and ignition timing.
"A competition ECU and throttle stop screw."
How it works
- Just a little black box and a screw is all it takes.
- Gets rid of the 1/3-throttle stumble of the stock ECU.
- Allows nearly limitless tuning with the GYTR Power Tuner.
The low cost of the kit shows Yamaha is serious about letting you get the most out of your WR. A standard replacement ECU runs in the $500-plus range, so the kit is really a deal. It comes with very basic instructions and the toughest part is figuring out where they hid the ECU in the first place. (It is between the gas tank and the air box and is difficult to see till you remove the tank.) The other part included is a different throttle stop screw for the throttle body to allow the bike to be operated at full throttle. Standard the bike only allows about 1/3-opening.
The instillation takes about a solid hour and you have to be careful with the locking clips on the electrical connectors. They can be tricky to disconnect and we even snapped one of the retaining clips on reassembly. We weren't worried as the fit of the connector was beyond snug and we fastened it so it could not come loose. Adding a little bit of dielectric grease when installing the ECU is also a good idea.
If you are going straight from the restricted throttle, you will be blown away with the huge increase in power and how far the bike will now pull and rev. If you are going from a fully opening throttle with just the ECU swap, the power and pull will not be as impressive, but you will notice the bike no longer has the low-end stumble at about 1/3-throttle. If you plan on changing the muffler, this ECU is a must.
We rode the bike with the stock muffler (smallest restrictor removed) and with the standard mapping (all zeros) for a little bit and it was OK, maybe a little rich in spots and seeming like it was set up to be run with a more open muffler. We wanted to keep the WR quiet so we started playing with the mapping through the GYTR Power Tuner. We leaned out the fuel and this woke the bike up but mostly it stalled a lot less. What the WR really liked was bumping the ignition to give it a little to a lot more throttle response depending on the traction conditions. Our WR, with a stock muffler now runs nearly as hard as our YZ250FX with its spark arrestor and FMF Q4 Muffler.
Just getting rid of the WR’s stumble was easily worth the $107.05 price. But having the ability to use the Power Tuner to get the bike to run perfect was even more impressive and the key to getting the most out of your WR.
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"Having the ability to use the Power Tuner to get the bike to run perfect was even more impressive and the key to getting the most out of your Yamaha WR."
