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It sounds like the US-spec ones are the only ones with the thermowax - think of it as a mechanical choke for cold start.
The thermowax prevents the double throttle from opening all the way, so it keeps the fuel mixture rich by resticting intake into the engine - how an old-fashioned choke would work on a carb.
Once the coolant gets up to temp and melts the thermowax does it release the double throttle plates to fully open up.
-Ted
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