I've been running Pennzoil air cooled 32:1 from day one and will continue unless I try some Stihl ultra that I bought. Run what ever good oil you have on hand.
Too short of a pipe set up and large props don't work well with this engine, but you will never know until you run it.
Jeff, it is not running perfect right now, it has run better and will, when I get my header length right. My son wanted to go flying so I figured I might as well shoot some video.

What pipe are you running and what is the measurement from the beginning of the pipe to the middle of the rear reflector cone??