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Remove the spark plugs and try to get the engine to turn over then. If it still will not spin, make sure that all of the battery cable connections are tightened securely. This includes the ground cable from the battery to the block, and the positive cable from the battery to the solenoid.
If all if that is good and with the plugs out, the engine will still not turn over, try to rotate it by hand at the coupling between the engine and the jet. This could be a bad engine, or it is full of water.