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The pilot (or slow) jet is responsible for idle. As you open the throttle, the carb transitions from the slow jet to the main jet, via the pilot mixture screw. Adjust the pilot mixture screw to eliminate a stumble as you crack the throttle. If you need to open the screw more than two turns, the slow jet is too small. If you have little or no stumble and the bike starts and idles well, the slow jet is a good size.
It does sound like it needs more fuel, but that's based on a tight intake tube. If you have a vacuum leak as Rich suggests, all bets are off. I'd replace that intake tube first.
If you're at sea level, the bike will need a fatter main jet than one at higher elevations.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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