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Different markets usually get different jets in carbs, different tunes on EFIs, even if all other engine parts are the same. TW200 runs a particular size jet in the US of A market, except California, which runs one size bigger, same as Canada, and Australia and New Zealand run one size bigger than that. 49-state jet is perfect for 11000 to 14000 feet of altitude, Cali/Can jet works great 5000 to 11000 feet, Ausi/NZ jet works great sea level +. When talking jets, use the numbers stamped on them. Remember some carbs can use jets from several manufacturers, and most number systems do not match.
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