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

 

Try dilling the vent hole in the gas cap a little larger.That sems to be the biggest cause of that problem.

 

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...????

 

Sounds like a classic bad coil problem.

 

I would go for the coil too.

 

any test that i can do to confirm a bad coil, and is one brand better than the other or do you just order one off e-bay...thanks

 

If you have a test light check to see if the positive wire to the coil has power once it cuts off. If it has power and you have no spark at the spark plug I would replace the coil. Also, you can take cold water and pore it slowly on the coil once it shuts down. Then if it instantly starts again, bad coil. This is a old school way to check.

This is a classic coil problem. Runs fine cold, shuts off hot. Sometimes they will give you a bad missfire. I had one give me trouble for about 6 months in a old jeep I had. Would run fine for weeks and weeks then it would just quit. Couldn't figure it out. Then I had a old timer tell me about the water trick. So sure enough after a few weeks it shut off. Pourd some water on it and it started right up. Went to NAPA and got a new coil and didn't ever have a problem again. There are ways to tell by reading the OHMS in the coil with a multimeter, but I believe you have to know what the specs say they should read.

 

thanks ghcoe and you other guys, i''ll try the cold water trick when it does it again, probably tommorrow afternoon when he gets home from school. I'll check back to let you know if that was it or if i need to check something else, he's gettig tired of pushing it back to the house..lol

 

try the Magneto

falcon 110 would run fine for about 17 min. then shut down. once shut down gets no spark. replaced coil and everything still would run for 17 min. then shut down.

replaced the Magneto no more problem.

 

thanks s16 for your help that sounds exactly like what my son's is doing, do you know of anything on the internet that shows how to replace the magneto with pictures...thanks again