The delta is in conversion efficiency of the gas engine. There's "HP', and then there is "brake horsepower". The brake HP of an engine is the work product, with all of the internal loads, and lags taken into account.
A 25HP engine will typically produce between 12-16 brake HP. Diesel might be a bit better with no intake vacuum.
For the motor, I would try a 16HP 1750RPM and see how that works. Without knowing more about the engine, it's kinda hard to be precise.
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