I have a Garelli RS that has always run pretty well. The only issue I've had was the rubber clutch does not want to slip like it should after you come back down to an idle. So it wants to push a little when it's idling. Naturally, I need to goose the throttle to keep it from dying when stopped.
Now, the thing is only good for 2 starts off the line from a stop. It has no power unless you're reving. I can ride 35-ish all day w/o stopping, but once I do stop, it has no umpf to take off again.
I've got 140lbs of compression, no leaks, normal timing, a good plug, brakes aren't hung up, and the carb is clean. I've made no changes in the airblox recently either.