Does anyone know what can be wrong if your motor turns just fine without prop then I put the prop on and it is the stiff? I crashed the plane the motor was on but not nose first I wonder if the crank is bent or what don't make any since it feels fine without the prop. Bye the way the motor is a os 91fx if anyone might have a clue what is wrong please help me thanks.

it takes quite a bit to bend a crankshaft,before you tried to turn the engine over did you flush it out with anything to remove any dirt/foreign material?

I took the motor apart and put the prop on and still is tight my problem I think is my front bearing I just can't seem to figure out how it comes out if you know can you gide me in the right direction please, I don't want to mess it up.

Deleted as you found your problem and fix in the other thread.