NAS3A1 Carburetor Stumbles on C-85

[Bill Morgan]

My carburetor (NAS3A1) (C-85) is "Stumbling" when going from the idle circuit to the run circuit. It has not done this in the short time that we have had it. The only thing we have done is set the idle rpm up from about 400 rpm to 550 rpm. On the ground static, if you slowly increase the rpm you can get it to accelerate to a high rpm. If you advance the throttle fairly rapidly it will almost die. These observations are with the airplane (STATIC) on the ground. I think that if you were in flight that air flow through the prop would disguise the symptom??????? Please advise. Thanks, Bill

 

[bob turner]

 

[cubdriver2]

 

[dnnewman]