In the US, the big change was introduced in '02. It included:
1) brakes went from independent front/rear to partially linked EVO brakes. Both are ABS and either will stop the bike very well. (Can someone who knows better confirm the EVO brakes in '02? I'm pretty sure they're used in '04.)
2) There are some plastic changes near the front end/windshield.
3) Factory cruise control became available in '02
The KGT starts with the '02 bodywork and if you want some extra protection it can be fit to any '02 and later KRS.
I'm not aware of any engine changes but that doesn't really mean anything.
There are color changes from year to year and there may be other changes that I don't know about.
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