Re: temp. for 1992 Mariner 150 Magnum II
sounds to me like you have a poppet valve that isnt completly opening or not opening at proper temp. also if the motor has run hot in the past the wax inside the copper or brass 'cup" on the thermostat wont force the thermostat to open at the proper temp. as the wax gets hot it expands and pushes the tstat open if it has been extremely hot before and some of the wax expands out this would cause the tstat to not completly open or open at a higher temp. just my 2 cents
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