Matt
On my trip to OSH from Seattle I had a similar problem. I actually had to
throttle back to 26 inches to get engine to run smooth, my fuel pressure
indicator was very low prior to throttling back. Landed and checked my
Andair gascolator and found it to be full of fine black crud. Cleaned it and
power was restored! I normally filter all my auto fuel but did not on this
trip to OSH with 100LL. On way home I again experienced rough engine after
flying some 800 miles. I discovered a slight fuel leak in front of the port
carb between the intake manifold and the carb. I flew 5 or 6 hours home with
a slightly rough engine . My port EGT ran hotter but all other indicators
were good. Flew at 10,500 home. Called Rotax tech. He thinks could be a
slight leak in intake manifold where carb is attached or contamination in
the fuel float bowl and maybe balancing is off. I will be checking all of
these and let you all know. The engine is a work horse and wants to keep
going even when abused with bad fuel. I had a similar issue with a 912 in a
Kifox some years ago. The engine would run smooth and then very rough and
then smooth out for no particular reason drove me nuts trying to find issue.
Turns out there were small alumin. shavings in port carb bowl that would
move around and sometimes plug a fuel port and then drift away only to do it
again! These metal shavings must have been left in bowl during manufacture.
This was a new engine and I was the first to open carb bowl to look. So if
there is something foreign in your cab bowl it will cause roughness.Bottom
line is your issue is likely fuel related
Regards
Jerry 914XS Mono
----- Original Message -----
From: "Matthew Carpenter" <europaxs@gmail.com>
Subject: Europa-List: Rotax 914 problem/question
>
> A weird problem with our 914 showed up on the way home from Oshkosh last
> Wednesday.
>
>
>
|