ORIGINAL: BubbasanJohn
Hey guys, I have a brison 3.2 in a zero I am flying. This engine is great and really hauls the mail. My question is that when I tune it on the ground, it has an awesome transition from idle to WOT. When I am flying at anything less than 3/4 throttle, it seems to burble or sputter. Transition is still good while in the air and i can blip the engine from idle to higher settings to control decent on landings for example. This effect does not seem effect the running of the engine and when throttling back up it readily responds. I just dont want to get into a dead stick situation while flying.
Any help would be appreciated.
may be air preasure in the cowl is making your carb pump more fuel in then needed.try venting your carb diaphragm cover,the one with the small hole in it, to out side the cowl.this has work real well in the past for me when i had the same trouble.you can just make out in the one crapy picture the aluminum tube on the end of the fuel line,with the end of it pinch shut with two small hole drilled in it.it is tuck in just between the ignition and fuse,under the jip ties.