Sw1 is a single trigger switch that makes and breaks the connection between R1 and ground. You can use a "tilt" switch that will open and close when say the steering is moved - or when the bike is lifted off its side stand. But it should be possible to improvise some sort of simple pendulum device that would be more responsive to other types of movement - and so offer improved protection.
The circuit is designed to use an electronic Siren drawing less than about 500mA. It's not usually a good idea to use the bike's own Horn - because it can be easily located and disconnected. However - if you choose to use the Horn - remember that the alarm's relay is too small to carry the necessary current. Connect the coil of a suitably rated relay to the "Siren" output - and use its contacts to sound the Horn.
The circuit board and switches must be protected from the elements. Dampness or condensation will cause malfunction. Connect a 1-amp in-line fuse AS CLOSE AS POSSIBLE to your power source. This is VERY IMPORTANT. The fuse is there to protect the wiring - not the alarm. Exactly how the alarm is fitted will depend on the make of your particular machine - so I'm unable to provide any further help or advice in this regard.
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