This modification allows the use of the 300 hp Lycoming shielded ignition harness on the 225 hp Lycoming engine.

By trimming the lower section from the engine baffles and replacing the aluminum with a rubberized baffle seal, it is now possible to retorque the cylinder base nuts without removing the baffles. Since the nuts need to be retorqued every 100 hours, a $6000 labor saving can be realized over the life of the engine and the baffle mod encourages regular cylinder base nut maintenance.

Engine liquid locks have been the Achilles heel of the radial engine design. By installing automatic drains on both the #5 and #6 intake pipes, oil can no longer collect in these pipes and cause liquid lock but rather drains to the back of the cowling where it can be collected.

The original oil seals for the magneto and generator drive gears were leather seals that retained moisture, caused corrosion on the gears, and hardened with age. A modern nitrile rubber seal is now approved that directly replaces the original leather seal.

All reciprocating and rotating engine assemblies are balanced to within 4 grams of one another. This produces an exceptionally smooth running engine free from the vibration characteristics of engines assembled from unbalanced random parts.

At each overhaul all applicable Lycoming Service Bulletins are complied with. Though these Bulletins are not AD's nor mandatory, compliance with them extends the life of the engine and gives an added margin of safety to the operation of the engine.