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My aircraft just came out of annual. A very expensive annual as fuel pump replacement coincided with rubber replacement and the engine had to come off to fix a leaking seal at the back.....

Engine has 820h TT.

Anyhow.. the other day when running up, I developed a significant mag drop - approx 1200RPM when the Right Mag only selected. This coupled with a sudden drop in EGT to around 350 C, followed by a slower drop to less than 250 C on cylinders 1 and 2. 

Max EGT at full power on all cylinders around 750 C with BOTH selected - lower than I think it should be?

 

This suggests to me that there is no ignition to the cyl 1 and 2 on the right magneto. 

Does this sound right?

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