i got a brand new air filter this year.
Possible on the jet kit, i dont know much about carbs so i havent opened them. Runs great it town though really fast for what i normaly do with it for commuting.
Im hoping to get a house soon, then this winter tear into it since im not riding it daily like i was before.
Im kinda with you on vacum leak as i have problems with idle, just either does 2200rpms or stalls when is stop. No where inbetween and once its warmed up the rpm nob doesnt nothing for adjustments. All the rubber is pretty old now on a 93 i might have to look at the hoses closely.