I just finished my first season running a propane-fueled small outboard on a small boat I have. Made by a company called Lehr and derived from a Yamaha motor. It can take either the 1lb Coleman style bottles, or plug via hose into a grill tank.
I only have 15-20 hours on it, but so far I really like it. Lehr really plays up the “green”, angle, but thats never a selling point for me. It’s definitely cheaper than gasoline (each bottle gives a comparable running time to 1/3 a gallon of gasoline, and I can refill them from a grill tank for about $0.60 per. Works out to $1.80 for a gallon of gasoline equivilant).
AND it takes care of the “green” problem of Ethanol gumming up the carb. A real problem with small outboards.
Thanks for sharing that. I wonder when we will see that for more small engines like lawn mowers, etc.