I got a new stator in 2/18/10 rode the atv maybe 3 time's and now the stator is junk agian! Anyone know what would cause it to burn up so quick

 

What kind of quad? Which engine?

How do you know the stator is bad? Which part of the stator is bad? Battery charging section? Ignition power supply? Ignition Timing Pulse?

What are the symptoms you are experiencing?

 

It's a sunl 100, the ignition side, I have no spark

 

There are other casues of no spark besides a bad stator.

Unplug the CDI and measure the resistance of the AC ignition power pin in the wiring harness to ground. What do you measure?

Leave the CDI disconnected and measure the AC voltage on the same pin in the wiring harness to ground while cranking the engine. What do you measure?

Measure the Timing / Trigger pin resistance to ground (engine stopped) in the wiring harness? What do you measure?

Measure the AC voltage to ground on the same pin while cranking the engine. What do you measure? Be sure to set your meter on the lowest AC voltage range since this will be a small voltage (but not zero).

The stator is just three coils of wire that happen to have some magnets whizzing by. There isn't much to go wrong unless there is mechanical abrasion, or unsecured wiring that vibrates loose. There isn't any significant power available in the ignition windings so those can't 'burn up'. If it really is the stator that is bad (which the above tests will verify) then before replacing it again it might be worth looking inside to see if there is just a broken wire that need soldering back on.

This is your CDI, right?



If you have a 4 pin CDI (less common) then we'll have to back up a bit and take a slightly different path.

 

Yes that is my cdi, ign pwr .04 cranking is 0 trigger is .01 cranking 0

 

I don't think you are doing the measurements right. The reason is that the two coils you are measuring are completely independent of each other, yet both coils read wrong. One coil is inside the flywheel, while the other is outside the flywheel. The odds of both failing at precisely the same time is small - unless something catastrophic has happened like your wire bundle from the stator got wound around the flywheel. But you would know that if it happened, I would think.

The resistance of the AC power pin wire should be reading about 400 ohms (or so) to ground. The resistance of the trigger winding should be reading about 150 ohms (or so). When measuring resistance you should get an infinite reading when the leads are hanging free in air, and the resistance should read zero when the leads are shorted together. You should be using the lowest scale possible that will still read 500 ohms without overscaling. Thus I would look at the meter and choose the 1K or 2K scale (1K is 1 kilo-ohm or 1000 ohms, 2K is 2000 ohms).

The AC voltage on the AC power pin should be 50-80 volts AC cranking. To check whether you are getting the meter to read right, try measuring your household AC power at a power outlet. After you get it to read 120 volts AC (assuming you are in the USA) then take it over and measure the quad AC power voltage while cranking using the same settings.

The voltage on the trigger pin should be 0.3 to 0.5 volts AC while cranking. You want to set the meter on the lowest AC range possible. 2 volts full scale would be great but many meters won't go that low.