ORIGINAL: Dave in UAE
Yeah the engine ran very rough for both runs and most of the short 3rd run, until she started to lean out and "transition" as the fuel ran out, but for the brief second or so she ran quite smooth. Should have shut her down when she started to lean out but was too slow to get it through my thick skull she was out of fuel!
Yeah this is fairly typical.
The manufacturers recommend settings that are overly rich in the hopes that you do not ruin the engine while breaking it in.
The Magnums arrive fairly rich... and once you start leaning them out, things improve... just remember to take it slowly as you are still breaking the engine in.