I would put money that there is something living in the exhaust. If it was sitting that long I am guessing something is calling your exhaust home. I had problems with a 250R ATV that would fire but would not stay running. We found a whole nest in the head pipe. If you get it started again see if you have good pressure coming out your exhaust. another sign of this is smoke coming out of you carb. The real easy way to test this is to take the exhaust off and start it up. You will really piss of the neighbors but it will tell you if it is the exhaust. Ways to make it faster see if someone makes an aftermarket exhaust. that is where I would start.
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