I have an OS 46 FX engine which is about 3 years old. Last year, after about 6-7 gallons of fuel, the engine started running erratically, and after inspection I discovered that the liner was peeling. OS technical support has been very helpful and they sent me a new liner/piston for the engine.


Since then I ran about 4 gallons of fuel into the engine, PowerMax 5% with 4 ounces oil added. Since a few days, the engine doesn't run good... Today I deadsticked and damaged the plane. Not too bad, but I have to rebuild the landing gear area.


I just removed the head of the engine... and well, the liner has started to peel again.



I would like to know what are my options for this. I know the engine is out of warranty, but still I believe a liner should last more than 4 gallons of fuel... I run the engine about 400-500 rpm from peak, and I do add oil to my fuel... So I don't think it's an operating procedure problem.


Thank you,