RE: Hydrolock Help!
If it was cold out and your engine is new it will "pinch" the cylinder on a new motor, after you do what enjoymentboy said, if fuel don't spray out the glow plug hole, you might try loosening the plug just a touch and heating the cylinder head with a hairdryer, The heat will expand your cylinder, and loosen the stuck piston. Start the engine, then tighten the plug back down. I run a lot in cooler weather and til your engine is broken in this may happen several times. once it starts make sure the engine heats up before running it hard. Hydrolock and cold weather/new engine pinch are about the only two things it could be, exept of course for broken internal parts and or a defective engine, but if it's the stock engine, it should be good to go.
Take care,
Jay