posted 01-31-2001 09:31 AM ET (US)
An ideal engine for a Whaler 15-Sport is the Yamaha 70 HP. This is a 3-cylinder 2-stroke engine.This engine only weights 230 lbs! As the 15-foot hull is sensitive to weight, this will be an advantage.
The engine has power tilt and trim, which will allow you to trim the boat for best performance.
The down side is the 2-stroke, classic three caburetor engine design. It will smoke, be less fuel efficient, and emit more unburnt fuel and other pollutants.
The upside is the engine is very simple, straightforward, and mechanically refined, so it should run a long time.
This engine is available in either oil-injection or pre-mix fuel/oil versions. You save more money going with the pre-mix model, and gain more simplicity.
This engine has been made by Yamaha since the mid-1980's, and it is a proven design.
Even among 2-stroke engines, its power to weight ratio is a standout.
Of course, it does not fit well with ecology concerns. But then you have to rationalize this by asking: how much fuel are you going to burn in a season?
Last year I probably only ran 40 gallons of gas through the engine on my 15-Sport. When I drive my V-8 Suburban I might use that much gas in one day of towing the boat on the highway on a long trip. I don't feel that the planet or the water will suffer so much that I have to spend $7,000 on a new engine.
And, looking at the total ecological picture, what happens to the old engine? Does it go in a landfill? If I use it until its useful life has been exhausted, perhaps I will actually reduce the net pollutants.
--jimh