Since I bought my Moki 1.8 three years ago, I have run a Zinger 18-8 (tried 18-8, 18-10, 20-8 various brands) on the two planes it has powered, and use only Byron FAI fuel, OS#8 plug with a Cline PFCS regulator. Never and I mean NEVER have had a problem!

These engines require quite a bit of break in time, a lot more than your average 40 or 61 glow. If you have a fairly new engine just have to wait untill you run a few more gallons through it. But, Take it easy, run slightly rich and you will be rewarded with an awesome engine. I have mine in a Midwest Super Stinker and it will easily hover at half stick - and thats NO NITRO fuel. Also, if you run even 5% fuel you will have to add a head shim of 5 thou or so or you will get predetonation.

AJC