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Twin cylinder Kohler engine?
Is it firing on both cylinders?
So everything works with deck belt off the pto?
And engine is running fine. And deck is free?
If it were safety switch, it would not work with belt off. So engine can't handle the load.
Good fuel flow to carb? Or just enough to run without load?
So does it act like engine stalls? If so, it has to be electric clutch or deck.
Clutch will engiage with or without belt. It looks to be non-adjustable
Could be a safety switch, and the ignition module has delay that kills engine after the blades start.