Just picked up a 2000 yamaha 15 hp 4 stroke. Noticed when i had it out for the third time today that the water visible from the water pump totally dissapears at anything over half throttle or so. The motor didn't show any signs of over heating. I assume it has an overheat alarm but not positive on that. At anything under half throttle it has a nice healthy looking stream coming out. I'm a little hesitant to take it out now not being sure. Any ideas?
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