I decided to run the ST40 one last time before I switched the ignition to the 51. I wanted to get some numbers so I could compare them more accurately. Also, the carb seemed to be acting a little odd the last run. I took it apart and cleaned it out and when I reassembled it and put it back on the engine was back to being very consistent. I assume the new tank I bought to run it on gasoline had a bit of trash in it. I always blow them out with the air compressor but that's not perfect. Could have been a little piece of flash broke off from the vibration. At any rate, the CHT today was steady at 245. The rpm's were 14,200 full throttle and at 12,100 which was about 3/4 throttle, it ran 15 mins on 6 oz of 87 octane mixed 16:1 with Zenoah full synth oil and still had almost exactly 1/4 tank left. All my testing today was with an APC 9X7 sport prop. The timing is still at 28 deg.

I broke the ST51 in on glow fuel today as well. I've owned several 51's and none transitioned as good as this one. It also idled better and lower than any of my others from the first minute it fired. I wanted to get numbers from it on glow fuel so I can see how the spark and gasoline affect it. 11X6 prop 15% nitro Omega fuel. The CHT was steady at 210. The rpm's at peak were 14,100. Now I am off to do the switch.