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Engine acts like it's in hydraulic lock and will not turn over. Help anyone?

It could be that, take the spark plug out and try to turn it over, if it spins over faster but nothing shoots out of the plug hole, the valves may need adjusted. If it spins over fast then slows down (with the plug in) it's most likely the valves need adjusted.
also is your battery charged up? should be at least 12.5 volts sitting. if it doesn't turn over easier without the plug it may be something internal, or a weak starter is a possibility
also engine model number will help us greatly. should be on a tag that looks like this, Along with the Mower's model number also, should be located on a tag on the bottom of the seat.