I am experiencing a slight vibration whilst at cruise speed / rev's. I
have tried a number of things to rectify it including balancing the prop
(thanks to Mark Burton), checking the carb mounting rubbers for splits,
balancing the carb's and changing the spark plugs. All to no avail. It
is not a major vibration and, having got a little paranoid about it, it
is maybe mostly in my head now but I am still slightly concerned about
it. Seems to be worst at around 110 knots with the prop at 'cruise'
setting, i.e. 5000 rpm and a manifold pressure around 23in. Engine is
912S with an Airmaster prop.
Any idea's?
Incidentally when checking the carb mounting rubbers I did discover a
split starting in one. It hadn't gone right through but was significant
so I have changed them for the latest mounting rubbers. This has
probably been discussed before but If you are not sure whether yours are
the latest, look at the jubilee type clip which holds them to the carb.
The latest have a spacer inserted to stop you overtightening them.
Another check is the number on the flange. My old one's were numbered
267787 and the new one's 267788
Richard Iddon G-RIXS
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