Well, I finally was able to run the engine again. I tried my APC16/8 and got a peak reading of 8800 rpms. Then I put the 15/8 back on and got 9380 rpms. That sounds more like it. So I guess the tachs (both) temporarily found the "Bermuda Triangle". I was able to get a smooth idle at about 2100 rpms. Transition from idle to full and vice-versa was nice and smooth! As soon as my fiberglass landing gear arrives, I can rebalance the plane and go flying!! I can't wait. With the Saito 100, I was getting a peak r.p,m. at about 9000 with a 14/8 Now I'm getting close to 9400 with a 15/8 and the engine is not fully broken in yet. I guess I'll order a new set of wings also in case I rip them off!