Let me guess, they sold him a whole CDI and coil setup? I smell something…..
Basically, if the stator will plug into the CDI it will work. I’ve swapped around parts from about 1990 to 1996 or 97, they all work. Coils, I’ve used just about any year with just about any ignition, they all work.
Clark’s suggestion is probably number 1 to check, bad coil or cap/wire number 2, open or shorted wire in the harness number 3, and bad stator :( number 4.