46% Ziroli OliTigerw/ 104cc inline twin. Running a Master Airscrew 24x12 prop. 1800 idle 6100 rpm full throttle . non ethonal pump gas, mixed 42 to 1 with Walmart 2 stroke oil I get in gallon jugs. FrSky X8R Pro receiver, using my old Tranis QX7S transmitter. I believe this is the 4th engine I have used on this airframe.