My 912S hasn't run for almost 12 months. It started and ran well on ground runs.
Test flight was OK although there was some 'plucking'. Since then I have flown
three more times and am finding that the engine runs fine at full revs or climb
settings but when I back off at the top of the climb, it splutters and coughs
a bit and runs quite roughly as if it is missing a bit. Doesn't fill me with
confidence. I have pulled the plugs and they seem fine, nice even grey colour,
no oily plugs. Where do I look next?
Richard Iddon
G-RIXS
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