Define "run". Does it burn out a prime? Is it burping at all? Does it fire if you prime through the exhaust? Did you check your battery? Really hard to diagnose on the internet with only a few lines of information. Lime Mr. Holford points out, those little nicad igniter batteries can crap out at any time, and don't carry enough current to burn out a flooded plug. I gave up on those many, many moon's ago. Make sure the basics are all there and try again.
Type at you later,
Dan McEntee