Originally Posted by englishal
The answer is easy - lean the engine anytime it is burning too rich......simple.
Most certainly not.
When the engine is operating at high power (75% and above), it is designed to have a slightly rich mixture. This excess of fuel is used for cooling purposes.
Do not lean at 75% power or above.
Here is the exact information from the Engine manufacturer (Lycoming);
http://www.lycoming.textron.com/main...ngEngines.html
Regards,
DFC