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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