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I have twin 2006 Yamaha f250's. I had both impellers changed last year. This year my starboard motor started to overheat at low rpm's in a large trough of water. I had the impeller changed again by my authorized yamaha tech. The boat still overheated at low rpm's not at high rpms's. The tech change both thermostats on the problem motor. the boat still overheats at low rpm. I own the boat since 2007 and the motors just hit 130 hours. Can anyone hepl me before i change all the parts in the cooling system before I find the real problem! Im in South Jersy near Barnegat. thanks in advance.
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