Permanet Magnet Generator - Torque
If the gas engine has an output torque of 97Nm at a speed of 1500rpm (= 157 radians/s), that's an output power of 97*157 = 15.2kW.

If your generator is 93% efficient, then you won't be able to draw more than 0.93*15.2 = 14.2kW from it, even if you could with a bigger engine. It will all work properly, up to that power.

The maximum output power is limited by whichever of the generator and the engine has the lower rating. Small engine, big generator, you will be able to stall the engine without overheating the generator. Big engine, small generator, you will be able to overheat the generator without stalling the engine. Either way, it's a good idea to control what the electrical load draws to avoid overloading engine or generator.