It's very easy to hydaulic a heli engine due to it's mounting position, any excess fuel runs into the crankcase.

Before I got a proper fueling valve fitted, I always used to remove the pipe from the carb and fill from there so that no fuel went into the engine till I was ready to start it and if it was going to be stood for a while I always stand it "nose high" to prevent syphoning.

I start the heli by blocking the exhaust outlet whilst turning the engine with the starter. This way you can see the fuel get to the carb inlet and release the exhaust as it starts, but only with a cold engine.

Like has been said before, remove the plug and spin the motor...don't keep trying to turn an engine that is difficult to turn........damage WILL occur.

If it is fuel locked, you really need to know why it is. Is it your fuelling technique or is it the tank position. It shouldn't happen unless there's something wrong.

The other thing is your battery and starter. If your field battery isn't good it could just be not enough "Ummmmph".