The OS 120 AX is way too much engine for your 6 1/2 lb. Big Stick 60! Besides that it loves to suck up fuel fast!

You won't get much speed out of a 91 4-stroke engine unless you use a smaller prop and run it full bore which will only shorten the life of the engine.

A Super Tigre .90 would give you unlimited vertical but it won't stay tuned as well as an O.S. engine will.

If it was mine I'd have an O.S. 75 AX on it and fly it like a bat out of H???!

big dan