Running Rich

Jabiru 2200 / 3300 discussions

Running Rich

Postby Xenos29DN » Wed Dec 06, 2017 6:58 pm

I have a Jabiru 3300 on my Xenos with an Aerocarb. The engine suddenly started running rich. I've had over 400 trouble free hours until the other day it started running rich and would barely idle. Plugs were sooty black. Compressions were good. I could find no blockages. The air cleaner was clean. I could get it to idle smoothly if leaned almost to idle cut off. The needle seemed to be OK although I have not taken the carb apart. The throttle and mixture cables are secure. Has anyone had this problem with the Aerocarb? Or am I barking up the wrong tree and there's something else going on?

Dave
Xenos N29DN
Xenos29DN
 
Posts: 16
Joined: Sun Sep 25, 2011 6:58 pm

Re: Running Rich

Postby builderflyer » Thu Dec 07, 2017 10:10 am

Dave, you mention a clean air filter. Is it a K & N and had you just cleaned and oiled it? It's very easy to use excessive oil which serves to choke the engine. Otherwise, it's more easily explainable to suddenly experience a lean condition rather than a rich condition. Puzzling.

Thinking further.........I wonder if the Aerocarb needle orifice has come loose. I'd open up the Aerocarb and inspect for that possibilty.

Art,,,,,,,,,,,,,,,,,,,,Sonex taildragger #95,,,,,,,,,,,,,,,,,,,Jab 3300 #261/Aerocarb
builderflyer
 
Posts: 441
Joined: Sat Jul 09, 2016 12:13 pm

Re: Running Rich

Postby Xenos29DN » Fri Dec 22, 2017 6:58 pm

It turned out it wasn't running rich, but had "dirty" distributor caps. After a thorough cleaning it ran fine. Now I need to determine how they got dirty.
Xenos29DN
 
Posts: 16
Joined: Sun Sep 25, 2011 6:58 pm


Return to Jabiru

Who is online

Users browsing this forum: No registered users and 26 guests