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I suspect you will end up frying the clutch in short order. A mower clutch typically engages when the mower blade is not spinning and there is not heavy grass in the way. The initial reactive torque applied to the clutch is only the rotational inertia of the blades. The blades get spun up to speed and then the clutch remains locked as you proceed into the workload. A compressor, on the other hand, must start pumping into a tank already pressurized. When the clutch kicks in, there is a lot of resistance to overcome to drive more air into the tank. The clutch must slip as the compressor is gradually brought up to the same speed as the motor. I don't think mower clutches are designed for this amount of slippage from a dead stop or to overcome such a high static load simultaneous with a substantial mismatch of speed. The other issue is whether the motor's governor and carburetor can react fast enough to go from no load to full load without stalling. A slipping clutch will mitigate this, but then we are back to problem #1. But if the parts don't cost anything, it is worth a try...
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