Since it will restart after waiting a minute, I'd be inclined to check the fuel cap, like Kato says. Is there a short vent hose on top of the fuel cap? If so, try removing it and see if the problem goes away. Be careful, because gas might squirt out of the hose. I just use a length of vacuum hose and direct it into the steering stem.
If that doesn't fix it, does the choke have multiple settings? Does it make any difference where the choke is positioned when you have trouble?
BTW, it doesn't matter what the plug says on it, I'd promptly change it for an NGK from Canadian Tire. Several of the plugs in China bikes have been fakes.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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