Well got my 138cc Tecumseh in today. First weight figure: 24.2lbs! After breaking it down: 9.0lbs! What a drop in weight. I still have more to take off though, this may shed yet another 1 to 1.5lbs. My target weight was 8.0lbs bare. Most 150cc twins range from 7.25 to 8.5lbs bare so I think I'm on the right track. I have a 49cc coming on Monday so that will be next for some weight figures.