G'day everyone,
I have a powertorque mower sitting outside that currently has no blade carrier fitted. If I try the pull starter I get the exact same description as you are saying Pau13z, If I pull the starter slowly it will rotate, but if I go fast it will lock up like a car seat belt.
As NormK mentioned also, I think you have to make sure all the weights and the flywheel and also the blade carrier assembly is all fitted and secured properly, as this is the balance for the engine. It's also needed for the starter to work properly.
I tried removing the spark plug from the engine oustide as a test and it turns over real easy with no spark plug fitted and no blade carrier fitted.
If you have installed the flywheel, weights and the blade carrier securely and you still get these symptoms, maybe try removing the spark plug to eliminate the compression in the engine and see if it still locks up at all while using the starter.
Cheers!
