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2018 yamaha grizzly stalls after a short ride


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I was wondering if anybody seen that problem and know what could cause it 

it’s new to me 2018 Yamaha grizzly 700 with just over 4000km 

it starts fine and runs great until it gets to normal running temp. Fan turns on few times and than it stalls. If I try to start it right after It won’t start but if I let it cool for a while it will start and run normal for a bit and than stall again. 
so far I checked the stator output voltage and it’s around 22 volts AC between all 3 poles. I measured voltage on the battery while it runs and it’s around 14v so charging seems ok. 
I’ve read somewhere that it could be the coil but I’m not sure how to test it 

does anybody have any ideas what could that be ? 

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