As seanychen mentioned most people seem to go with the 91FX for 2 stroke power. Others have used the ST90(as you can see in Dave McDonald's video). I've even heard that some people were able to fit an OS 1.08 on a UCD.
Other than that I don't hear much about big 2 strokes in UCD's. Mostly Saito 100's, YS 91, Mag 91, and TT91 4 strokes.
Originally posted by obi1
Thanks Coolmarlin , but being cost conscious , what 2s (if any ) would give me full 3d capability