Mariner 90 Problems

I have a Mariner 90, about a 1990, that has since I have owned it a problem stalling at WOT.  When it starts to stall you can ease back on the throttle and it will smooth out.  I used WOT last weekend and it stalled and died.  It was difficult to start but finally did.  However, now it will not get up to speed.  It accelerates up to a point but will not go fast enough to plane out.  The engine sounds like it is struggling or bogged down. 

I am getting multiple answers from boat repair shops.  Some want to rebuild the carbs, others just clean them, and others want to replace stators or ignition box. 

Can you tell me which is more likely to be the problem?

Check the carbs for varnish, etc. Also check compression and spark. It almost sounds like it seized hopefully not. Carb problems in the float bowl (dirt, etc.) can cause high speed lean out. Bad news if the motor got hurt.




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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