KRNet I need help in trying to identify a problem. I fly a kr-2s with a 2100
revmaster with a revflow carb and ram air. My airplane has always been very
sensitive to mixture while flying. If I didn't have it set in that magic spot I
may get a slight hiccup. It's never that sensitive on the ground though as I
can do a full static runup (3000 rpm) on the ground while never missiing a beat
while playing with the mixture.
I went for a short flight on a clear sunny day with warm temperature and
climbed to 3000 feet asl. I was flying for about 20 minutes with the engine
sounding fine and then I heard a hiccup and started to play with the mixture
and it got better but then all of a sudden I heard another and then another and
it seemed that no matter what I did by either leaning or richening the mixture
it didn't make a difference. I tried the carb heat for a while with no
difference. I have 2 egt probes on the rear cylinders and they read fine from
1200 to 1350. By this time after trying different throttle and mixture settings
the rpm was down to 2500 and if I tried to increase the throttle the slightest
bit the rpm would drop sharply. So I decided to leave it and fly back at 2500
rpm. I flew for about 10 minutes (felt like a heck of a lot longer!) back to
the airport and right when I put the airplane in a dive back to the airport at
that same throttle setting, the rpm started to pick up and I had full throttle
control again.
I should mention that on the previous flight I had a similar experience
after a touch n go but it only lasted for 10 sec or so that I thought was
possibly carb ice or a very rich setting. Although my KR has been sensitive to
mixture in flight it has never had this problem before.
I have a couple ideas but I'd like to hear if anyone else has had a similar
problem or has any ideas from their own fresh perspective.
Thanks!
Mark Moody
KR-2S C-GHZO (based in CYXX Abbotsford, British Columbia, Canada)
[email protected]
