RE: GP Super Stearman
Crashland - the G26 is an excellent little motor.
It's somewhat heavy for the amount of power it outputs but the same applies for most gas motors if this size range.
Some people say that petrol (gas) engines come into their own in sizes of 50 cc and above because a glow engine of that size would be unpractical. I don't buy into that argument (or others)
I have the G26 in a 1/4 Taylorcraft and must say that it gets better and better with each tankfull I run through it.
I still run 1:32 oil mix but have switched to full synthetic. The oil I buy is what is used for high performance air cooled engies like motorcycle engines and racing engines.
The prop is an 18x6 wood prop.
I fly for 20 minutes at a time on approximately 500cc (1/2 litre) of petrol
So far, I haven't rouched the needles.
Carby hookup is somewhat tricky but I solved it by bolting an aileron bellcrank to a threaded hole that is in the crankcase straight below the throttle lever on the carby. I chose to do this rather than grind off the lever and replace it with an aftermarket unit. This has given me a very good acurate hookup.
You will love your engine.