Maybe you can cut off the fuel pump you could do some sort of "injector cutoff" kind of thing. You hit the switch to turn off the fuel pump while leaving it in gear for deceleration and when all the gas in the float bowl is burned up you could engine brake like a fuel injector car using no gas insead of at idle.
I don't think it would be a good idea to kill the pump and the ignition, while decelerating, as all the fuel in the float bowl would go out the exhaust unburned
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