Thanks everyone for their detailed responses, and to Nigel for info on carb
adjustment.
This 912UL has 560 hrs, and I operate off a strip at 5500 asl, usual ambient
temp
is about 28C. So I am sure it will be running a bit rich, and I was used to
slightly sooty plugs, but not to point of misfire. Recently I have been
operatring
a bit more at 12,000' asl (yes a 912UL/ fixed pitch prop will get me there,
but only 1 up)
I havnt done any carb adjustments recently, but having unblanked the radiators
it all got worse (all plugs but especially the cool back ones, (3 and 4) , so
the first thing is to blank them again, and see. And fly lower. Not enough
time
for all these tests, but will try a bit at a time over the next few months.
If it persists, then I'll look at the carbs again.
Thanks again.
All best
Richard
Kenya
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