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The EJK came with excellent instructions. Please refer to the EJK factory instruction when installing the EJK controller in your Grom. This thread is just to show some additional images and methods to supplement the EJK instructions. I will also post my tuning effort.
Remove the left and right side body panels from the Grom. If you have never done this before, the EJK instructions describe how to do it very clearly.
I chose to mount the EJK unit under the seat. I wanted it secured flat and that required I remove some of the plastic under the seat. There are two main wire harnesses and a ground wire that come off the EJK unit. One to the left side of the bike and one to the right. The one with the yellow and red wires goes to the left side and the one with the purple wires goes to the right side. As the instructions clearly say, make sure you don't route the wires where they will be pinched or touch hot parts of the engine. But also pay close attention to wire chaffing. Wires that are loose and floppy can wear against parts of the bike and the engine vibration will eventually cause the wires to be sawed into. This can create short circuits years down the road and can be hell to find and fix, so proper wire routing is by far the most time consuming part of this install.
![Motor vehicle Auto part Automotive lighting Vehicle Automotive exterior]()
Injector connector is easy to get to on the left side. Was marked with blue paint on my bike. These connectors should not require any twisting or bending to remove but they do have a water tight seal so are snug. Just pinch the lock tab and pull firmly. If it does not come apart, you are not squeezing he lock tab enough.
![Engine Auto part Vehicle Motor vehicle Fuel line]()
You are just pluggin the factory plug in-line with the EJK unit. The connectors only fit one way so don't force them, just line them up and connect.
![Engine Auto part Motor vehicle Vehicle Fuel line]()
Carefully fold the extra harness wire in to a bunch and secure to existing harness making sure it is not on a hot part and that it will not chafe against an edge or something. Easy, now go to the right side and find the 02 sensor connector.
![Auto part Engine Steering part Automotive fuel system Vehicle]()
Your right side may look a little different than mine because I did the Stroked-GT radiator hose/KTM filter intake mod. My 02 sensor wire has a small piece of yellow tape wrapped around it. Remember, this is a single wire inside heat protection tubing, be gentle.
![Engine Auto part Motor vehicle Automotive engine part Vehicle]()
Remove the left and right side body panels from the Grom. If you have never done this before, the EJK instructions describe how to do it very clearly.
I chose to mount the EJK unit under the seat. I wanted it secured flat and that required I remove some of the plastic under the seat. There are two main wire harnesses and a ground wire that come off the EJK unit. One to the left side of the bike and one to the right. The one with the yellow and red wires goes to the left side and the one with the purple wires goes to the right side. As the instructions clearly say, make sure you don't route the wires where they will be pinched or touch hot parts of the engine. But also pay close attention to wire chaffing. Wires that are loose and floppy can wear against parts of the bike and the engine vibration will eventually cause the wires to be sawed into. This can create short circuits years down the road and can be hell to find and fix, so proper wire routing is by far the most time consuming part of this install.
Injector connector is easy to get to on the left side. Was marked with blue paint on my bike. These connectors should not require any twisting or bending to remove but they do have a water tight seal so are snug. Just pinch the lock tab and pull firmly. If it does not come apart, you are not squeezing he lock tab enough.
You are just pluggin the factory plug in-line with the EJK unit. The connectors only fit one way so don't force them, just line them up and connect.
Carefully fold the extra harness wire in to a bunch and secure to existing harness making sure it is not on a hot part and that it will not chafe against an edge or something. Easy, now go to the right side and find the 02 sensor connector.
Your right side may look a little different than mine because I did the Stroked-GT radiator hose/KTM filter intake mod. My 02 sensor wire has a small piece of yellow tape wrapped around it. Remember, this is a single wire inside heat protection tubing, be gentle.
