Why sell them??? Yes, you have discovered 4-strokes. But that doesn't mean you have to give up on 2-stroke engines. I have gassers, I have 4-strokes, I have 2-strokes, and I even have electrics. Just because you use one type it doesn't mean you have give up everything else. There are some planes that are better off with a 4-stroke engine, while there are others that need to have a 2-stroke in. Fit the engine to the type of plane. Perfect example, the Sig Hog Bipe. My first one had an OS 61 FX in it. It flew the plane very well, but the 2-stroke just didn't seem right in the bipe. So I put an OS 91 4-stroke in it and it was a match made in heaven. But then on my Ultra Sport it is better off with the 61 2-stroke in it.

There is more fun in this hobby if you don't limit yourself!!

Ken