Boutree, The story should be the dog dragged the chain under the mower. Fuel position is probably compression stroke. Use your finger to cover the spark plug hole while you turn over the engine. You should get pressure that moves your finger off position. Trace the exh pipe to the head which is ex port , the other is intake. Compression gauge screw in adaptor or rubber nubbin, open throttle butterfly while cranking. Youtube shows people using feeleer guages, but no one can tell you how proper drag of the feeler is known. Practice