"Rick Durden" wrote in message
m...

Once you lean the airplane for cruise you need not change the mixture
on the descent. The checklist says to enrichen as necessary to avoid
roughness, so don't enrichen the mixture unless the engine runs rough.

Yes, but that statement should be further qualified by saying that descents
should be made at less than 75% power or else EGT and CHT could exceed
operating limits. 65% power sounds like a good number. Some carbed engines
with good fuel distribution will run smooth when too lean (close to peak,
either rich or lean of peak).