I would have come over if I knew you were there. Was it a chirp or more like a splat might have been too rich. Did you change the clip or the jet, maybe you just didn’t jet big enough or could be a low float level. Did you try a new spark plug or clean your ground wire? It might be leaking air on one of the fuel hoses or your pump might need a rebuild or could be dirt in the carb did you check the screen, are the vents for the bowl open.
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience