If your worried about the weight of the gasser--then the BME 44cc (2.7) might be the answer. It's lightweight and will easily swing a 20" prop.

PLENTY of power, but not insane. Lightweight--perfect for the APPLICATION at hand.

Don't buy a big huge engine for a small airframe in anticipation of yanking the engine out later and putting it on a bigger plane.

Buy an engine for each airframe. My rule is "Never strip an airplane that still flies." You don't want to install the engine on your 260 and fly it for a year and then yank the engine out of a perfectly good airplane just to install it in another airframe. Thats not the way to do it.

Buy the BME 44cc engine for your 260 airframe and fly it. When you get a 30% plane--then buy a ZDZ60, 3W-75 or a G-62 and convert it to electronic ignition.

Don't strip the engine out of a good airplane. If you can't afford to buy an engine for each airframe--then scale back to glow size planes and forget about gassers.

My HONEST opinion. Not meant to offend. Just the way I see it and the way I think.