Yup, them 4-strokes are heavy - that's why I don't have one on mine :cry:
Weird that the 'zuki 140 weighs less than the 115.
Now, you should do the same list on new 2-strokes and compare. The new ones are very clean and efficient too, plus weigh less.
Another option is to get a rebuilt older 2-stroke. I think mine is a rebuilt '98 Johnson 115 and it was like brand new (still is except for a nick or 2) - weighed about 320 lbs. Has about 60 hours on it now after about 2 years.
BTW, I helped you on your list, hope you don't mind