i don't know about non-us models but the carb that came on them from the factory over here was not any good. you might try replacing the fuel filter (it wont hurt) and i once had problems with bits of fuel hose showing up in my float bowl.
if you just want to replace the carb i suggest a weber they can be hard to adjust sometimes but are vary reliable and easy to work on. i got mine from calmini but other places might have them to (hawk suzuki has them also)
here is some links you might find useful
Samurai
Rocky Road is Earth's Suzuki Samurai Parts Headquarters!!!
and here is hawks' web site
HAWK STRICTLY SUZUKI | Welcome.
both rocky-road and hawk suzuki say to call them if you don't find what you are looking for so try them both
hope that helps good luck