Before you bolt the carb up make sure it has the lastest AD for the "Blue" epoxy float . If it a new carb it should have the blue float...check the paper work that came with the carb . If you are concerned about the fuel in the carb you can remove the drain plug on the back of the carb and drain it . The only other thing you might want to check is the finger screen on the inlet side of the carb . Probably not necessary if the carb is "new ."
After the carb is bolted on , run the engine to normal temps and during shut down see if the idle cutoff rise is the required 50 RPM increase when the mixture is moved to
Idle/cut-off ." If not you will need to adjust the ground idle mixture screw on the back of the carb . I am assuming it is a MA-4-5 ? The MA-3 should have a similar adjustment screw . The screw is labeled "Lean/Rich ." I can't remember which way to turn the screw if you don't get the 50 RPM rise ? SOOO may screws sooo little time ! You can Goggle for that info . If you don't have it , it may be a good idea to get a Marvel/Precision carb manual . You can get them off the web for free ! After you get the 50 RPM rise you may need to adjust the ground idle to get the 650-700 RPM . Mine runs smooth at 650 RPM .
You can read some of my prior posts regarding the carb problems I had , including an uncommanded engine shut down crossing the numbers at KSEE .
RB
