Kevin,

I have two Moki 2.1 engines that are set up the same firewall forward. I use the O.S. "F" plug and Omega 5% fuel. I tried FAI fuel but the throttle transition was not great and I could tell that the engines weren’t putting out full potential.

After watching another club member use the Omega 5% fuel I switched over and have never looked back. Both of my engine set-ups are side mounted with no glow driver needed and I use an APC 20x8 prop. My friend’s engine is mounted inverted, swings an APC 20x10 narrow APC prop, but otherwise has the same Cline Fuel Controller and fuel line routing as mine. His engine has not flamed out either. My engines are mounted on high drag airframes and my friend’s engine is used in a Mustang.

Get your high end needle set and then work on the low end. I still get the occasional “gurgles like a 4 stroke” just below ½ throttle, but I don’t operate at that setting very much so I haven’t worried about it. I tend to run my high end needle on the rich side since my engines are cowled up and I run wide open throttle most of the time.

Mike