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Yamaha WR250X/R Parts > EJK Fuel Injection Controller
EJK, short for Electronic Jet Kit, provides the best available EFI (Electronic Fuel Injection) controller for the Yamaha WR250R and WR250X. We recommend this product any time you are installing an aftermarket exhaust, intake, or when you just want to make your stock bike run better.
NOTE: EJK designs and manufactures these controllers and allows several other companies to private label them. This product, with the EJK logo on it, is identical to the one FMF sells with their logo on it.
Benefits on a Stock Yamaha WR250R/X:
If you're keeping your engine stock, an EJK EFI controller is one of the best bang-for-the-buck mods. The WR250R/X runs lean with the factory fuel map and really falls on its face in the low to mid range when you hammer the throttle. A Fuel Injection Controller will adjust the fuel mapping, making the bike run better, helping eliminate that dead spot early in the powerband.
Benefits on a Stage 1 Yamaha WR250R/X:
If you've decided to add an aftermarket exhaust and/or intake system (Stage 1 mods) to your WR250R/X, an EJK EFI Controller is HIGHLY RECOMMENDED if you want to take full advantage of those performance parts. Aftermarket intakes/air filters give your engine more air, and exhaust systems allow it to breath better. Without an EFI Controller, the bike will run lean and you may experience pinging or backfiring, and the bike may run hot. Additionally, without the proper fueling that an EFI Controller provides, you will see little to no performance gains from your new exhaust system and, in fact, your bike may run poorly.
Fitment: 2008-2019 Yamaha WR250R / WR250X
Simple and easy tuning with no dyno required
Simple Push Button Adjustment Interface
Does not require a computer or software to tune
Comes pre-programmed for the best results
Load Based Tuning takes into account RATE, TPS and RPM to construct three main zones for fuel adjustment
"On-the-fly' tuning. You can make fuel adjustments in your garage or on the side of the road
Does Not Interfere with Stock ECU Operation
2 Year Warranty
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** Available - Usually leaves our warehouse in 3-4 business days
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