earlwb

I have three of the little 9cc engines in use and they went through more than four gallons of fuel since I first started running them. That is a fair amount of flying considering how much fuel they consume per flight. The engines are still hanging in there OK. I used the Amsoil Saber pro oil at first, but it was carboning up the head and piston more than I liked, so I switched to Stihl Ultra synthetic oil instead. I feel that one needs to use a really good oil, preferably synthetic in order to ensure longer life out of the engines. The connecting rod is the main weak point as it doesn't do well with cheaper oils.