ORIGINAL: Augie11
ORIGINAL: David Bathe
I think Augie11 hit the nail firmly on the head when he suggested loose muffler.Jez', vibrating alloy (even very slighty) makes an awful black mess.
David- do you use teflon tape on your muffler connections? I find it keeps things clean and also must help in keeping the muffler tight as I haven't lost any lately!
I used High temperature silicone and no news after +50 flights... worked very well!!!! No leaks nor black cream around the exhaust or muffler.
The first tank I made while breaking made a little bit of black oil, from the secont up to now I barely realise about exhaust oil.
I'm running 18% oil + 10% nitro; propeller is APC 15x8 Pattern.
This engine is magnificent!!!!