I am running the new 40/50 4 stroke on a 1648 100 gauge alweld 2 trolling batteries 1 cranking battery myself and fishing gear with a 15 pitch Yamaha black no issues so far and sips gas. With 2 people running 37 mph wish I knew what to do to get 40 out of it but its a solid motor and water pump is way better then the old mega I ran for years.
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