My .02 we have an Achilles very similar to that I believe, floor boards and an inflatable keel. We have an older Johnson, 2 stroke 5hp and it barely gets on plane with just me in the thing, anything else, dog, wife, etc. no way. I looked at the Lehr propanes and to my mind the biggest advantage is clean handling, not the exhaust, but the fact that you don't have a gas tank to fill, and potential spill, was the plus for me. But as others said I read some really poor reviews. When I replace this motor I'm going with the smallest, lightest motor I can find.