J.D. Stewart's C-II
Owner, UltraFun AirSports, Norfolk, NE
After a single cylinder overheating an inspection showed lead fouling of one plug from the PTO side. I then decided to pull the engine and do a complete de-carbon job.
The PTO head had light, soft carbon, with a few deposits of lead. The bottom ring on this cylinder was slightly stuck on one side.
The mag head was very crusty with carbon. There was a darker layer under the light layer shown over most of the head.