Has it ever been started? If not some times the pinch can be so tight it feels like it's bound up, I ussually put about 3 drops of 3 in one oil or after run oil in the glow plug hole before I start a new engine so there's some lube to make it easier to pull and so it doesn't scratch the cylinder. Anyway, if it's been started it sounds like everyone said a flooded engine. Also take the pull start off and see if you can pull it vary carefully off the engine. Becarfull not to let it pop apart.