Rough idle when engine is cold
in 912 / 914 Technical Questions
9 years ago
When I first start the engine it runs as smooth as a baby,s bottom for about one minute then sounds like it is missing on one cylinder and vibration increases significantly. Engine has 360 hrs and is run on auto gas 5-10 % ethanol
No EGT or CHT sensors
What has been done:
Carbs just overhauled.
Differential compression test. Done hot, all cylinders 80/80
Regular compression test..automotive style. Done hot. All cylinders within Rotaxj specs.
Carbs synced.
New plugs.
After the engine is hot, this problem is greatly reduced or
goes away.
Could this be a valve issue?
Thanks
No EGT or CHT sensors
What has been done:
Carbs just overhauled.
Differential compression test. Done hot, all cylinders 80/80
Regular compression test..automotive style. Done hot. All cylinders within Rotaxj specs.
Carbs synced.
New plugs.
After the engine is hot, this problem is greatly reduced or
goes away.
Could this be a valve issue?
Thanks
