More Power for Evinrude 90


I have a 1994 90hp Evinrude with a jet on it.  The motor locked up.  What all do I have to do to get it equal to the 115hp Evinrude.  Is it just the size of the piston?



The porting in the block is different. The piston is the same. The heads and carbs are also different, with some changes to the exhaust system. In a nutshell, it is not worth the cost to change all the necessary parts to gain the 10-15 real hp between the motors.




Please submit whatever questions you have to  All questions and answers selected will be displayed on this page as they come in.  Note: though all boaters are welcome, priority may be given to I.H.R. members.  Randy can not be held responsible for any advice given.  Though his information and expertise is second to none, he has no control over what you do with your boat.  It is up to you to boat safely and act responsibly, and his advice is only to be used as a guidance for your high performance boat/motor of which you are the one responsible for the risks involved.

Mark C.


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