EFI Troubleshooting
If you're having issues with your EFI system, follow the troubleshooting steps below in order.
Step 1: Check Your Ground Connection
Be sure you have a strong ground from the EFI system. This is mega important. For instance, with our wiring harness we run an 8-gauge ground wire that goes directly from the negative terminal of the battery to the starter mounting bolt. We then attach the EFI ground wire, along with the 8-gauge ground wire, to that same starter mounting bolt.
Step 2: Verify Your Fuel Line Routing
Verify 100% that your inlet fuel line doesn't go anywhere above the bottom of the gas tank. This will cause an air bubble, and the fuel pump won't be able to suck fuel. It needs to be gravity-fed.
Confirm there's no air bubble by removing the inlet line and letting fuel run onto a rag as you plug it back in.
Step 3: Check Your Fuel Level
Be sure the fuel level is above 1/4 tank.
Step 4: Test Fuel Pressure
Remove the fuel line from the injector and let it spray into a rag. It should be 42 PSI.
Step 5: Check for Air Leaks
First, be 100% sure the plastic intake manifold spacer is removed. We don't use this, as it alters the intake size and can affect the tuning.
Let the bike idle, then spray carburetor cleaner around the intake and clocking flange. If the bike dies when you spray it, it's sucking air and will need to be sealed up.
Step 6: Check the ECU for Blinking Lights
Be sure there are no blinking lights on the ECU while it's running. If there are, hook it up to an OBD2 scanner. You can rent these from any auto parts store.
Step 7: Do a TPS Reset
Follow the video below to perform a TPS reset.
Step 8: Adjust the Air/Fuel Screw
Adjust the finger screw on top of the throttle body to find the highest idle point. Move the screw in or out until you find it.
Keep in mind this isn't an idle screw, but rather an air/fuel screw, so there isn't one exact setting. The goal is simply to find the highest idle point.
Although the system is auto-tune, it does not auto-tune between roughly 1,000–2,800 RPM. Tuning in that range is manual, so keep this in mind. If the bike dies when coming to a stop, this is the adjustment to check.
Step 9: Check Magneto Woodruff Key Alignment
Be 100% sure the magneto woodruff key slot is lined up with the woodruff key on the crankshaft (picture below). Failure to line this up will result in a no-start issue.
Step 10: Confirm You Have the Correct EFI Kit
Be 100% sure you ordered the EFI kit for the correct engine size. For example, if you have a 150cc engine, make sure you ordered the 150cc EFI kit. If you have a 171cc engine, make sure you ordered the 171cc EFI kit.
Step 11: Check the Fuel Pump Regulator
Watch the video below to test the fuel pump regulator. No tools needed.
Still Having Issues?
If you're still having issues, you may need to send the ECU back to us for a re-flash. At that point it's best to speak one-on-one.
Email us: rollingwrenchparts@gmail.com