Originally Posted by LynnEdwards

Most stators have three separate coils of wire in them. Yours may only have two since you may not have the high voltage AC power winding for an AC powered CDI. As mentioned before, look for the Black/red wire soming out of the stator. It would probably be one of the loose wires. If you have it then you have the third winding. If you don't, you don't have the third winding.

Winding 1: (Battery Charge winding) This winding is several hundred turns of wire of heavy gauge wire. It is connected to the yellow and white wires. You should measure 1 to 2 ohms between these wires. But remember that you don't need this part working for the quad to start up and run. It will run off the battery for long enough to verify the ignition system is working. If you have problems here then address them later once the quad runs.

Winding 2: (Ignition Trigger Pulse) This is a small winding (a pickup coil) which is mounted outside the flywheel. It tells the CDI when to fire the spark plug. One side of this coil is tied to ground. The other is usually a blue/white wire which goes to the CDI. It should measure 150 ohms or so to ground.

Winding 3: (AC Ignition Power) You may not have this winding if your CDI is DC powered. It consists of thousands of turns of fine gauge wire, It generates moderately high voltage (up to several hundred volts at high RPM's) to run the CDI. This winding is grounded on one side, the other side usually comes out on a Black/Red wire. If you have this winding it should measure 450 ohms to ground.

Measuring the resistance of these windings is quick and dirty, but not the best test. The best way to test the stator is to measure the AC voltage out of each winding while disconnected from the wiring harness and cranking the engine with the starter motor:

Winding 1: 9.5 volts AC (yellow to white wires)
Winding 2: 0.2 to 0.5 volts AC (Blue White wire to ground)
Winding 3: 85 volts AC (Black/Red wire to ground)