My sons coolster 150 with gy6 engine cranks and runs fine for about 10 minutes then just cuts off dead and will not crank back up...Yet when it cools down about an hour it will fire right up and go again until it cuts back off...anyone have any idea what this could be or where to start..thanks

 

Check venting, both at the gas cap and carb. One of the hoses could be blocked by mud.
Next time it dies, check for gas in the float bowl, by opening the drain at the bottom of the bowl.

 

nope not that, it seems to be an electrical problem, like something gets a little hot and shuts down til it cools back off, because after about 45 min to an hour it will fire right back up as if nothing ever happened...when it does it and i remove the plug and ground it to the engine and crank it i can't see any spark.but then after it sets for awhile it will have a spark at the plug...????