RE: 140 rx fuel
CoolPower 15/17
15% nitro 17% oil
Penty of power and good needle settings with OS "F" plug.
When you replace the bearing either use the Stainless bearing and or any other brand leave the seals in the bearing.
Number 1 enigne original last 125 flights.
Number 2 engine the original lasted about 40 flights. I think because it sat for long time inbetween flighs and bearing rusted.
Number 1 engine has 150 flights on replacement bearing that I left the seal in it.
Wayne Galligan