Are you talking 2-stroke or 4-stroke?
If 4-stroke, have you ever tried man handling one >10hp?
I'm pretty strong although admitidly have a hernia op to consider and I would say that 10hp 4-stroke is just about the limit of me lifting in/out of car.
Obviously 2-strokes are lighter, but only available in Europe as 5+ year old second hand. If you want newer, probably with better selection, then 4-stroke is your option.