Just to throw in MY $.02- ST2300 with a Slimline Pitts on a 1/4 Lanier Laser. 18x8 / 15% Powermaster.(smaller diameter carb,Not the 2500 one)
Ran out of the box-9600 rpm on the first tune. The carb needs a coat of silicone sealer on installation,the O ring is not enough(just a thin coat)
ST engines are not designed for Nitro fuel-they run better on less rather than more.Or at least a lot more reliably.
And 25% is $25/gal in Alaska.
I too am waiting for GP/Tower to start selling parts again-I managed to break the ring when replacing the front bearing.


http://candoo.rcwing.com