Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
Will the engine turn if you use wrench on it? If not remove spark plug and see if piston may have fluid on top of the piston.? If it does, spin the engine with spark plug removed to clear the cylinder, re-install the spark plug and see if engine will start?
You have starter off? Just use the ring gear on the flywheel to turn the engine using screwdriver to turn flywheel.
So engine will turn 360 degrees, and starter works when removed? But will not spin engine if stater is installed and spark plug is removed? Do you ave a voltmeter to test battery voltage? Has to be 12,5 before start and not drop below 8 volts when starter is selected.
What is battery voltage when you engage starter? Less than 8 volts, battery or cable problem. over 8 volts, starter or cables! I'm thinking battery problem. Does not have enough amps to crank loaded engine.
DC volts, which will be straight line diagram. Red lead on positive and black lead on negative battery terminal.
So battery test good. I think you need a new starter!
Did you try it with the spark plugs removed?
But engine does not turn full circle? Has to be a reason engine is locked. I'm thinking you may have a valve stuck open.