912UL Running Rough
in 912 / 914 Technical Questions
10 years ago
I'm about at the end of my string.
I have a mid 90's vintage 912 UL, 80 hp. 70" warp drive, taper tip prop.
My 912UL is running rough from 2000-3000 rpm. (Kitfox IV)
What I have done so far:
Synchronized Carbs
Dynovibe balanced prop
Removed, cleaned and synced carbs
Removed, cleaned, rebuilt and synced carbs
Rebuilt engine mounts
Disassembled and reshimmed gearbox
Replaced gearset and dog ring reshimmed gearbox
Re-synced carbs.
The vibration has gotten better, but it's still not what it was a year ago - smooth at all rpms.
I get vibration when throttling back on downwind, or whenever the rpm is in the 2000-3000 range.
The motor will idle at 1800 smooth as silk. Anything above 3000 rpm is also smooth. The engine makes good power and the plane climbs like crazy.
I'll listen to any ideas at this point… :unsure:
I have a mid 90's vintage 912 UL, 80 hp. 70" warp drive, taper tip prop.
My 912UL is running rough from 2000-3000 rpm. (Kitfox IV)
What I have done so far:
Synchronized Carbs
Dynovibe balanced prop
Removed, cleaned and synced carbs
Removed, cleaned, rebuilt and synced carbs
Rebuilt engine mounts
Disassembled and reshimmed gearbox
Replaced gearset and dog ring reshimmed gearbox
Re-synced carbs.
The vibration has gotten better, but it's still not what it was a year ago - smooth at all rpms.
I get vibration when throttling back on downwind, or whenever the rpm is in the 2000-3000 range.
The motor will idle at 1800 smooth as silk. Anything above 3000 rpm is also smooth. The engine makes good power and the plane climbs like crazy.
I'll listen to any ideas at this point… :unsure:
