Put it on a charger overnight, then remove the plugs and turn the engine over to make sure its not hydrolocked with bad fuel. Then try again with some 91 non ethanol fuel.
My first thought is bad fuel, only because you rode there fine, filled up then it died. The 8 minutes you rode is just enough time to drain the good fuel from your fuel line and carbs.
It could have locked the rear for any number of reasons, one being that the carb was still dumping some fuel in the motor after it died.
Anyone else have any ideas?
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