I installed the Scorpio i900 alarm on my gts. It works just as advertised, but you will need to be creative in the install when placing the various alarm components on the bike.
I bought a motion/shock alarm (Gorilla 7007) It seems easy to put in, connects dirctly to the battery but one has to be inventive on its placement. Since it has a tilt sensor it wouldn't seem right on a scooter on its center stand. Even though I bought the alarm and didn't install it. I actually turned around and bought a Xena disk alarm. I tried to buy their XR1 but that didn't fit. Their website has a (which model is right for your bike" link. I checked with the dealer and they don't think their will be a problem.
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