MrPaco, my truck runs like crap (over choked black exhaust smoke) lately when the engine is cold upon first startup... Warmed up it runs good; I don't think stepping on the gas does much to the RPM when the engine is cold & choked (seems the choke is automatic somehow)... Blasting the choke plate with carburetor & choke cleaner in the Mikuni seems to help and cures the problem for a good while... At least it did before; time to do it again... Temps here in Hawaii go as low as 59F once in a great while at 6AM but back to 70s & 80s in an hour... It does not seem to matter what the outside air temperature is coz starting my truck with 80F weather it still chokes itself and runs like it's very rich... The engine RPM does rise with a cold engine then once warmed it goes back to idle, all by itself; tapping the gas pedal don't do a whole lot... When I first bought the truck it was even worse; cold engine = black smoke = super rich = pumping the gas pedal to keep it running... No telling how long (in years?) my truck just sat waiting to be auctioned off by Uncle Sam... To get it started the first time it needed BooKoo starting fluid & cranking galore & more cranking & more cranking and some more; fuel lines musta been bone dry... This was in Barstow, California a rather dry desert area...

Anyway, without reading the FSM -- maybe try cleaning the carb & choke plate hinges with da spray... Moral of the story; moving to a warm climate will not cure the problemo..!