Thanks Fred, I will look for some more recent small-bore fuel. I even have a pint can of red-label Cox Racing Fuel, which I think is 40% nitro! I have Aerodyne 25% and 35% half-A fuel, several quarts, which is probably literally a lifetime supply, but it too is at least 20 years old.
Speaking of which, how MUCH fuel does an OK .099 and/or McCoy .098 require to run for 4 minutes in CL use? I may be using these motors as an Old Time Stunt entry in the Wee Duper Zilch. Got the full size plans and am ready to cut balsa.