Write the voltages down and continue to the next step.There should be at least 0.05vAC coming from the trigger wire (Blue/Yellow).There should be between 20vAC ~ 100vAC coming from the CDI power wire (Black/Red), although much lower voltages will still be able to produce spark.Place the black lead of multimeter on a metal surface of the engine while using the red lead on the tips of the wires. While cranking the engine, use a multimeter to check for voltage coming from the Red/Black (CDI power wire) and the Blue/Yellow (trigger wire) coming from stator.Locate and disconnect the Black/Red and Blue/Yellow wires coming from the stator, where they plug into the main engine harness.Set your multimeter to read in VOLTS “AC”.
Sends a signal to the CDI to let it know when to send fire to the plug. This winding is usually wrapped in white cloth material and sealed over with clear epoxy.Ī simple type of crankshaft position sensor. Of these windings, one is dedicated to supplying the CDI with ignition power. Note the wrapped ignition winding, and trigger moduleĭepending on your stator type, you have either 6, 8, or 11 windings. Push the tab down and the pin will release. Looking from the front of the plug, you will see small metal tabs on each pin which secure them to the plug. This can be done with a sharp narrow tool like an ice pick or stiff paper clip. Being very careful not to deform or break the pin, remove the #5 wire from the CDI plug at the harness.Create a jumper wire from pin #4 directly to a good grounding spot on the engine.Before beginning to troubleshoot ignition problems, it is best to bypass the switches. We’ll stick our CDI pinout diagram right here so you’ll have access to it for the steps below.Ī very common cause of no spark is a defective ignition or kill switch. You’ll want to come back to this for reference throughout the guide. Although there are many differences in wiring between models, most GY6 ignition systems work the same as shown in this illustration. Basic GY6 Diagramīefore getting started, take a look at this diagram. To diagnose your ignition system, you will need to do each of the steps in this article, in sequence. Stator (6th winding and trigger pickup module).What we will be doing here is troubleshooting these ignition parts starting at the source, and working towards the spark plug. There are 4 major components that work together to produce spark, if any of these are defective spark will be lost. The 150cc GY6 ignition system is fairly easy to troubleshoot in the case of malfunction. The first version was downloaded over 136,494 times and we’re happy that this information continues to help so many people! Getting started: How it all works This guide covers almost any of the 150cc buggies, scooters, or ATV’s with the standard “AC” CDI setup.