I have a Linhai LH200ATV-B. I changed the engine oil, gearbox oil, spark plug and air filter plus changed from 95 octane to 98 octane fuel recently. Since then whenever I ride at high revs (on the road) for 10-15 minutes it stalls and I have to wait 5-10 mins before it will start again. It runs fine at low-ish revs (in the woods) for long-ish rides without stalling. I want to narrow down the problem. There seem to be a lot of things it could be. Oil pressure, engine temperature, carb mixture, CDI, ignition coil, stator. Any diagnostic tips would be a help.

 

i would start by changing fuel lines and giving the carb a good cleaning. their is a blockage someware causing u to drain the bowl under high rpm. Fuel filter if it has one as well