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ContinuousWave: Whaler Performance
Repowering an 11 Sport from 1986
|Author||Topic: Repowering an 11 Sport from 1986|
posted 11-29-2003 06:07 PM ET (US)
I would like to explore the possibility of repowering my freshly rebuilt 1986 Boston Whaler Sport 11'. I currently have a 1969 Chrysler 20 HP Model 2003 that I received from my father which is like new in condition and operation. This motor, however, feels underpowered but I have not checked rpm's at propeller yet so the jury is still in on this veredict.
I am considering both two and four cycle engines, American and Japanese although I am biased for American motors, however, since the maximum horsepower for this engine is 20 HP the range of options is very small. I am currently considering a Johnson 25 two stroke at 32 cu.in displacement and 111 lbs., a Honda 25 four stroke at 30.5 cu.in and 148 lbs., a Honda 20 four stroke at 21.4 cu.in and 101 lbs. a Mercury 25 at 24.4 cu.in and 114 lbs. My Chrysler has 19.96 cu.in and 74 lbs. of weight, finally I am also considering a Yamaha 25 two stroke at 24.1 cu.in and 101 lbs. of weight. This last engine is very popular in Costa Rica and it strikes me as a modern engine using 100:1 pre-mix. Also the Mercury dealer is very enthusiastic about my questions.
In my short hours of boating and long hours of internet surfing about boating, I have come to realize that engine displacement is very important but also fuel economy and most important reliability.
posted 11-29-2003 06:52 PM ET (US)
Robert, I like the Honda 20HP at 101 pounds. That is a new design. Jim
posted 11-30-2003 12:35 AM ET (US)
The Honda is a nice looking motor and if it's reliable as most Hondas are it should be a long lasting motor. The four bladed propeller is a curiosity also. I wonder what would happen if I try to tow a skiier in this boat?
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