How do you figure that? This plane's recommended 2 stroke engine on the top of the range is a 150. Granted a engine such as a 148 MDS won't let you torque roll the plane but I doubt performance is horrible. As for the OS any motor that swings an 18" prop at 8700-9000 RPM with 15% nitro is not going to leave this plane looking like a slug during zero airspeed aerobatics.

Rich said he was looking for opinions on the 135 Moki and the OS 160. Between these two I think the obvious winner is the OS. The OS is known to fly well on 5-15% nitro with low fuel consumption for an engine it's size. The OS also has an impressive midrange powerband for a 2-stroke engine and is VERY compact. Now if this comparison was opened up to the Moki 1.8 and small gassers THEN you would have a heated debate on your hand. There is MUCH more to consider then looking at the manufacturer's spec on engines, especially model engines which have no stated testing method or standardization. What you have to rely on is personal experience of users.