I had one of these when they first came out - good smooth runner - I used (U guessed it --32-1 synthetic oil mix as I do on ALL my engines) - once you get the choke setup such that it will easily choke as needed - then set the needles as necessary - it is a very smooth runner .
The muffler which comes with it is quite effective but honestly-it strangles the engine . and cuts available power seriously
A header into a larger can is a better setup if you need more power. a 19x8 prop is "about right" for slow scale flying.