Mag Checks - A cure for rough running.

[A and C]

Prevention is better than cure !

Lycoming publish a sevice instruction on this subject and they say that the problem can mostly be cured by the correct engine shutdown drill as follows.

1. Set 16-1800 RPM for 20-30 seconds
2. Reduce the RPM to 1200
3. Mixture to ICO
   I will look up the Lycoming SI number so you can all read what the engine makers say about this problem.