peeling sleeve on 75ax
I have had several of my OS engines peel their liner, 2 46fx's a 55ax and now my 75ax. I have over 25 nitro planes with various brands of engines and have not had any issues with any other engines. I treat all of them the same. I use 15% nitro S&W fuel with 18%oil (16%syn/2%castor) I run my engines dry each day and use a few drops of Marvel Mystery oil in the carb. I put caps on the carb. and muffler for traspotation and storage. I don't overly rev my engines but I don't run them slobery rich either. I replaced the liners in the 46fx engines with the magnum XLS 46 piston and liners which has worked out well for me. I purchased new OS piston and liners for the 55 and 75ax engines and I have not used them since. I am NOT bashing OS I just want some guidance with how I should care for the 55 and 75ax engines this time. I used an 13 X 4 APC sport prop on the 55 turning 12500rpm's on a Stik and I used a 13 X 8 3 blade MA prop on the 75 turning 10500rpm's on a Calmato 60. The 55 has been in the box for two years since it peeled and the 75 just peeled last week. The bearings look OK but I am installing new BOCA bearings anyway. Any guidance would be appreciated. I really liked these engines they start easy idle and transition very well. I attached pictures of the 75ax.