My h23 came with a 2-cycle Nissan 5hp longshaft as original equipment. Just picking it up it feels like about 50 lbs. According to Nissan's online owners manual (mine's at the boat), it weighs 20.5kg, which my calculator says that works out to just over 45 lbs. dry weight. By the way, 5hp is plenty for pushing a h23 at or near hull speed. The Nissan continues to work great. As a side note, my outboard mechanic said that it was designed for use by near shore fisherman in asia, with the expectation it would be used for long hours every day, so its a tough little engine.
Having said all this, its possible that Hunter used other outboards as original equipment during the h23 production run. We know that they used three different makes of mast, so its possible that other things changed over the length of the run.
Jim Kolstoe, h23 Kara's Boo