The watt rating for golf bag motors normally ranges from about 50 to about 150 watts. Unloaded, your motor is using about 42 watts as you indicated. I imagine it is rated at about 100 watts (about 1/8 hp).
There are a few electric mowers here, and they tend to use motors in the 750 - 6000 watt range. (1 to 8 hp) with riders using heavier motors.
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