Hi Dave,
I used the 20/20 YS fuel and had better results (idle and mid) but still have a re-acuring problem. In the pits the engine idles great , mid good, lots of power at full 9300 with 14-10 prop. I taxie to the runway and the engine keeps quiting ! I tried every LSN setting with the same problem. If I keep the idle way up I was able to take off and fly with no problems, the engine ran good. Is it possible the plug is fouled and needs to be changed? If so what is the best plug for a YS 91AC?
Regards,
Frank