I previously reported on Ethanol woes on July 12, 2012. Now I find that the butterfly valve shaft is binding. Previously the movement was smooth as silk with the lightest touch to move it. The binding will not let the engine RPM return smoothly back to idle. Speculation is there may be some Vinyl Ester resin residue gumming the bearing areas. There was a small amount of residue in the gascolator drain. Pulling that thread a little more: Could be residue in the fuel passages in and about the carb jets. Steve Bennett advised to use carb cleaner to clean the carb. The royal pain will be getting the carb out of the maze between the firewall and the engine.
Sid Wood Tri-gear KR-2 N6242 Mechanicsville, MD, USA [email protected] ------------------------------------------------------------------------ ...I built the wing tanks in my Diehl wing skins using Vinyl Ester Resin per the Diehl instructions. When I put in 92-octane auto fuel containing 10 percent Ethanol, I got the same reaction as if the tanks were made with Epoxy. Surfaces slowly started to dissolve, fuel turned yellowish brown and a sticky brown goo starting clogging the sumps... ...I now have drained the tanks and left the caps off. After 2 weeks the goo on the inside surfaces has "re-cured" hard just like the original. The quick-drains had become clogged and have been replaced... Sid Wood ------------------------------
