Originally Posted by RVDan
Nice writeup. I have to ask though what would be the cause of the excess carbon buildup and what is to stop it from happening again in short order?
To be honest I have no idea why one cylinder decided to built up excessive carbon/lead on the guide than the other ones. I checked the other 3 cylinders, and the exhaust valve was smooth as silk. Manufacturing irregularities? Unlucky? Who knows. Some people have recommended the following suggestions:
1) Add Marvel Mystery Oil (MMO) to my fuel and/or oil.
2) Add TCP Fuel Treatment to the fuel to act as a lead scavenger
3) Switch from Phillips 20W50 aviation oil back to Aeroshell
I'm not going to do any of the above. I am going to keep running as I always have to see if the issue occurs again -- with the only caveat in I will check my exhaust valve wobble on every annual now that I know I can do a cylinder in about 15-30 minutes.
If you suspect you have an issue or want me to give a look at your engine, let me know and I will happily fly over to KFDK and assist you.