to test the stator use a volt meter and see if it is putting out 13.5 to 14.2 volt then it will tell you if it is working or not

 

Remove the "hood" - where you access the radiator fill -
The CDI box will be a rectangular box with several wires coming out of it. One wire connector pair will have a white wire and a white/red striped wire (Pulse or Trigger Coil). Using a multimeter set to Ohms, unplug this connector and read the resistance on the side going back down to the engine - you are looking for around 100 Ohms. Plug this connector back together.

The other connector will be a three wire - red, green, and black/red stripe (this is the Exciter Coils) - unplug this connector and read resistance on the side going back down to the engine. Across red and green should read about 1.6 Ohms. Across black/red stripe and green should read about 450 Ohms. Plug this connector back together.

If either the Pulse Coil or the Exciter Coils are bad, they can be replaced if you have a little mechanical and electrical soldering abilities. Both of these parts can be found on Ebay - the exciter coils are referred to as "Bobbins"

I have also seen instances where these parts Ohm out correctly, but on inspection have found that "something" (usually loose parts from the recoil starter) has knocked the air gap of the Pulse coil out of range. Between the "trigger" (raised metal strip) on the flywheel and the Pulse coil should be about 0.025" - you can measure this with a feeler gage set.

BTW - these parts are located behind the recoil starter - if you need to get to them you will need to remove the floorboard and recoil starter cover - if you have to access the Exciter coils, the flywheel will need to be removed.