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Posting a reply to: Re: Mercury 60hp 4 stroke

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Beatsbyair

Posted 10/16/2014 2:47 PM (#735310 - in reply to #733912)
Subject: Re: Mercury 60hp 4 stroke

Posts: 123

I have the same motor and I had a similar issue. I took it to a dealer, and they could not solve it. I kept on reading and reading and finally I read something about the thermostat getting clogged up. I checked the thermostat, and sure enough, there were a bunch of pebbles in it. I'm guessing this was preventing the thermostat from opening and the motor was getting too rich/not rich enough fuel to run at certain RPM's or water temps. (I mostly only had problems in cooler water i.e. 60 degrees or less.)

Before finding this out, I replaced the fuel lines, fuel filter, and primer bulb and it didn't help anything. Not saying these aren't the issue, but they weren't in my case.