How to Fix Rotax 912 Carburetor Leak
New 2022 carburetors for 1994 Rotax 912 UL For more than 27 years, the Rotax 912 carburetors of our plane delivered trouble-free performance. That changed suddenly. It started innocuously enough: a small drop of fuel out of the cowl seen during a preflight check in Albuquerque, NM. Guess 1: Expanding fuel in the center tank Probably overfilled the center tank during the recent fueling. The fuel has expanded, hence the drop of gas on the floor. Let’s ignore this and fly back to Dallas. Back home, next Sunday. Another drop of fuel on the floor after moving the plane to the front of the hangar. The expanding-fuel explanation is wrong. We remove the top of the cowl. The underside of the air filter of the right carburetor is wet with gas. Guess 2: The needle valve in the float bowl no longer closes properly. No wonder. The needle is more than 25 years old. Easy fix: We order two needles for the two carburetors. When the new needles arrive, we open up the carburetors, pull out the old n...