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  Repowering an 11 Sport from 1986

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Author Topic:   Repowering an 11 Sport from 1986
rbruce posted 11-29-2003 06:07 PM ET (US)   Profile for rbruce   Send Email to rbruce  
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.
 
My options are doing nothing and enjoying the Chrysler for there are many spare parts still available, respecting the BIA/Manufacturer's HP limit of 20 HP and looking into the Honda or lower horsepower motors such as 15's.
 
What is your piece of advise?
 
rbruce

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Barney posted 11-29-2003 06:52 PM ET (US)     Profile for Barney  Send Email to Barney     
Robert, I like the Honda 20HP at 101 pounds. That is a new design. Jim
rbruce posted 11-30-2003 12:35 AM ET (US)     Profile for rbruce  Send Email to rbruce     
Jim:

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?

Thanks,

Robert

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