if you can smell it idling or at part throttle, its probably the pilots he went up on. if that's the case, turn the fuel screws in in 1/2 turn increments until its better. I run bigger ones on one of my 2 and the fuel screws are in quite a bit to increase circuit velocity.
just fyi... the mains don't come into play until 3/4 to wide open throttle.
also check if the needles are shimmed. he may have gotten a bit heavy handed.
also double check the enricher cable is releasing all the way and not hanging up one of the plungers from seating all the way. (do this 1st)
and make sure he didn't jam anything in the airbox to richen it up, especially the intakes at the back of the airbox. while steve does this, its in conjunction with other mods. some people have just tried restricting there and done nothing else, and that's a half-assed incorrect way to do the job.