I know its not a quad but it has the same motor as a lem quad. I got my kid a 95 ktm sxr 50 dirt bike and it runs awsome. after about 15 to 20 minuites it dies and wount restart untill cold. I had this problem on a snowmobile and it was the stator plate. it would heat up expand and had a break in the wire coil and would die. sound like the same thing. what do you think. its pretty funny Im working on this and not the chinse quad!!! Oya jack my kid loves riding the moored lt80. now that hes almost 4 but he says it needs moore power!!! LOL I replyed ( moore power is in the turn of the throttle screw)

 

LOL
Sounds like a bad CDI/coil Loren.

 

thanks sir !!!