From online outboard site:

Tohatsu's 3.5hp outboard motor is an excellent choice for larger canoes, small tenders and inflatables, as well as long shaft applications such as mini-pontoons and small sailboats. This 3.5 HP Tohastsu Motor is an award winning outboard that weighs just 41 lbs and offers exceptional fuel economy.

http://onlineoutboards.com/tohatsu-3-5-hp-outboards.html

I've got one of those... it is more than 30 lbs, but still "heftable."

I tie a 4:1 lifting set up to the handle to ensure that it goes "quietly" into the dink. I tried one of those lifting harnesses, and just was not happy with how it wrapped around the motor... just looked ready to slip right off.

So I tie the dink to the mothership, then get in and gently lower the motor to myself.

Not a big fan of the built in fuel tank either... it never seems to be enough fuel when you need to go places. On the flip side, in calm waters, I can row the inflatable just fine.