The Electronic Jet Kit (EJK) is the most popular fuel solution from Dobeck Performance. It is the #1 EFI controller on the market for installation time to riding with great performance. The EJK is a plug and play fuel solution that comes preprogrammed for Stage 1 modifications (Intake & Exhaust upgrades). The EPA leans out the low rpm and light load cruising zones to meet emissions; the EJK will correct this lean condition as well as adjust the fueling for stage 1 modifications. With the EJK you will also have the ability to adjust the fueling for any other modifications you may make down the road. You will see improved torque, smoother drivability, and cooler engine temps. Forget downloading maps. Forget looking up settings. Forget additional tools. Install the EJK and go ride; you will have a great tune up right out of the box. The EJK offers simple on-the-fly adjustability and access to 6 modes of adjustment using three push buttons. The EJK implements DP's load based technology which takes into account changing loads for various riding conditions. Load based tuning technology provides a smooth dynamic tune up that breaks the drive cycle into 3 main adjustment zones instead of filling in an entire TPS vs RPM fuel grid. The EJK is water resistant, and comes with a 2 year warranty. No dyno time required; no computer needed. EFI made easy. This EJK Gen 3.5 fits 2007-2013 Honda Rancher 420. EJK Gen 3 vs Gen 3.5: the Gen 3 adds fuel to stock while the Gen 3.5 can add & pull fuel from the stock fuel curve. The Gen 3.5 is necessary when the vehicle is running overly rich or you plan to add performance mods that will richen up the vehicle. In most cases, the Gen 3 is an adequate solution. Please contact us if you are unsure of which version you need.