Evinrude 90 Rebuild Options

I am currently in the process of rebuilding my 1997 90 HP Evinrude.  It spit a ring and scored the cylinder wall. I am guessing that the cylinder is going to have to be bored 20 to 30 over to erase the scoring.  I plan to have all 4 bored and install new pistons.  My question is since I have to bore the cylinders anyway, is there anything I can do to boost the horsepower of the engine that is inexpensive and will still maintain a reliable engine.   Darryl



If it is the new 60' Eagle Block, it is very, very expensive to correctly get more power. If it is one of the old crossflow 90' V-4's, you could port it to 115 spec. and see a decent gain in performance.




Please submit whatever questions you have to IHRTechTalk@yahoo.com.  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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