Re: 1960 Evinrude 5.5 hp thermostat

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October 15, 2015 at 11:27 pm #25601
Mumbles
Participant

    You don’t want your motor temperature much over 160 F. otherwise salts and minerals in the water leach out and start building up on the water jacket surfaces. Newer motors and four strokes commonly use the 163 Tstat so I’d take it back and get the proper 143 one.