The only MDS I ever owned was a .28, started easily, ran quietly and smoothly and quit in flight at full throttle so often that I finally gave the engine away. I tried everything including replacing the fuel lines, carburetor o-ring, fuel filter and glow plug. I adjusted the low end and high end mixture everway till Sunday trying to find something that would keep this thing running and I finally had to throw in the towel and give up. Amazingly the engine would run beautifully at half throttle or less and would never quit. Anyway that's my two cents worth on MDS with one exception, and that is the 68. Everybody I have met that runs a 68 MDS loves it and wouldn't trade it for the world. Go figure!!

John