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    Yamaha 150 four stroke (Twins) running hot

    Hello and thank you up front for any advise I receive. My father has Twin Yamaha 150 four strokes that are running hotter than they should. The temp runs right in the middle, half way mark at 3,000 rpm. Once you go to 4,000 rpm the temp goes to 3/4 and jumps a 1/4 in the guage. Both guages are...
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