This also lets you know that your stator is living. If you get a nice blue spark then you have most likely eliminated or at least discounted the coil being faulty. Immediately before things have time to cool (yes, wear gloves), place the plug wire on the plug, hold the plug end, where the spark is, against the cylinder head and press the start button for a few seconds. Without bombarding you with technical numbers or making you buy testing equipment, I would simply run the ATV until it dies and pull the plug. As the engine heats up the coil looses its resistance and fails to deliver the charge needed to start the engine. Coils can become faulty due to extreme temperatures and age. The final test if all else proves to be in good working order would be to test the coil first and then the stator. Make sure the wiring in these areas has not been melted or chaffed in any way. The next step if Compression is good will be to look over all of the wiring harnesses that might come in contact with hot surfaces, such as exhaust or even the cylinder head. If low or out of spec compression is found then you will need to service the top end of the engine. Having a Yamaha Service manual to compare proper “In Spec” compression numbers is very important. Compare the two results and if the second is significantly lower than the first you might have found your problem. Start with the easiest and perform a compression test when the engine is cold and after running the Grizzly until it stalls test it immediately again. It’s a pain, but a necessary evil unless you just want to haul it off to the dealer. The best way to figure out this kind of problem is to take one issue at a time. This could be a combination of things ranging from electrical wiring, engine compression and stator or coil failures. The longer I let it cool down the longer it will run. Then about 5 minutes it shuts down again. Wait for a couple of minutes and it will start right up. It starts right up but after about 10 minutes it just shuts off. ATV AnswerMan Helps a 1999 Yamaha Grizzly 600 owner
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