We get calls and emails from customers all the time who want to improve the performance of their bikes. Some are on a budget and just want to add an inexpensive slip-on muffler, and some have bought used bikes that run poorly because aftermarket exhaust systems have been installed with no changes to the stock fuel injection system.
One aftermarket product that is often ignored is the Electronic Fuel Injection (EFI) Controller. Simply stated, an EFI Controller, like the EJK EFI Controller or FMF EFI Power Programmer, is highly recommended any time you install an aftermarket exhaust and/or intake/air filter on your fuel injected bike, otherwise you will see little to no performance gains, and the bike may even run poorly. Additionally, EFI Controllers can provide benefits even if your engine is completely stock. See below for details...
Benefits on a Stock Bike:
If you plan to keep the stock exhaust system on your bike, installing an EFI Controller is possibly the best bang-for-the-buck modification you can do. No other bolt-on aftermarket part will give you such a noticeable performance difference for the same amount of money. Bikes we focus on, like the Yamaha WR250R/X and Honda CRF250L, run lean with the factory fuel map and really fall on their faces in the low to mid range when you hammer the throttle. An EFI Controller will add fuel where the manufacturers have deemed necessary to help improve performance in the low and mid-range power curve and still provide plenty of top end performance. You will also notice a more crisp throttle response and your bike should run cooler. Later, if you decide to add an aftermarket exhaust and/or intake, the EFI controller can be adjusted appropriately to take advantage of the new performance parts.
Benefits on a Stage 1 Bike (Aftermarket Exhaust and/or Intake):
If you've decided to add an aftermarket exhaust and/or intake system (Stage 1 mods) to your bike, an 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 even leaner than it does in stock form, 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. EFI Controllers like the ones from EJK and FMF are pre-programmed to work with Stage 1 mods (exhaust and/or intake) and will really transform the powerband of your bike.
All EJK and FMF controllers come pre-programmed to the recommended base light settings, which represent typical stage 1 (exhaust + air filter) modifications. It is recommended that you install the EFI controller, take a few test rides, then decide if you want to do any further tuning. Adjustments to the Controller can be made "on the fly" and no computer or other external device is needed to make these tuning adjustments. While tuning the bike yourself is possible, obviously the most accurate way would be to let a qualified shop with a motorcycle dyno do it. We stuck with the pre-programmed base light settings on all of our project bikes and they run great.
Combining EFI Controllers With Exhaust Systems:
All of the FMF Performance packages we sell for the WR250R/X and CRF250L include an EFI Controller. Combining the EFI controller with a quality aftermarket muffler, mid-pipe, and header will really wake these bikes up, making them much more fun to ride (and they'll sound better too!). See links at bottom of this post for details on these performance packages.
Standard Features of the EJK and FMF Electronic Fuel Injection Controllers:
• Simple Plug-n-play installation
• 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 Stage 1 mods (aftermarket exhaust/intake)
• 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
NOTE: EJK designs / manufactures EFI controllers and produces private label versions for several companies. The EJK EFI Controller is identical to the one FMF sells with their logo on it.
Package Deals That Include EFI Controllers:
• WR250R/X FMF Q4 Performance Package Deal at SRmoto
• WR250R/X FMF PowerCore 4 Performance Package Deal at SRmoto
• CRF250L FMF Q4 Performance Package Deal at SRmoto
• CRF250L FMF PowerCore 4 Performance Package Deal at SRmoto