I had the same problem.

It appears that the fuel flowed from the tank to the carb without priming. This is probably because the fuel level with a full tank is above the level of the carb, and there were no points in the fuel line above the level of the fuel in the tank in my set-up. So, when I followed the directions for the first start (primed it 4 times), the motor compression-locked due to excess fuel.

Don't prime the motor if you can see that the fuel has already reached the carb without priming.

If you can't pull the motor over, loosen the glow plug until you can. It will start this way, then just tighten the plug after it starts.

If you can pull the motor over but it's not firing, then check the battery and plug for good heat.