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Engine slows then dies at WOT- 1960 18hp Johnson Seahorse
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<blockquote data-quote="who pooted?" data-source="post: 274219" data-attributes="member: 940"><p>Just got back, and still having the same problem. The motor did start right up after fixing the carb choke. I quickly got WOT and shortly (45 sec-1 min. WOT) the engine begin to decelerate. This time it did not stay at 12mph. The speed got down to 8mph and then would go back to 11/12, then back to 8 mph. I shut the engine down and fished for a while (hour or so), and then prepared to leave. Motor at WOT would only get 8 mph, then it gradually built to 13 mph by the time i go to the ramp.</p><p>I did like Pappy asked and put my hand on the cylinder head after WOT and burnt the ever loving crap out of my hand. Got two nice blisters! The motor was still spitting water fine though.</p><p>I've got the boat back in the garage at home and i'm definitely hearing a grinding noise when i turn the flywheel by hand. It sounds like it's coming from the lower unit. I'm wondering if the impeller is messed up. It doesn't sound like metal on metal. It almost sounds like the water pump pumping and maybe something hindering it. </p><p>I forgot to answer one question that was posted concerning the gas tank. It is not the original metal one, it's a 6 gallon standard red plastic one with primer bulb that i've had on it for the 8 years i've owned it.</p></blockquote><p></p>
[QUOTE="who pooted?, post: 274219, member: 940"] Just got back, and still having the same problem. The motor did start right up after fixing the carb choke. I quickly got WOT and shortly (45 sec-1 min. WOT) the engine begin to decelerate. This time it did not stay at 12mph. The speed got down to 8mph and then would go back to 11/12, then back to 8 mph. I shut the engine down and fished for a while (hour or so), and then prepared to leave. Motor at WOT would only get 8 mph, then it gradually built to 13 mph by the time i go to the ramp. I did like Pappy asked and put my hand on the cylinder head after WOT and burnt the ever loving crap out of my hand. Got two nice blisters! The motor was still spitting water fine though. I've got the boat back in the garage at home and i'm definitely hearing a grinding noise when i turn the flywheel by hand. It sounds like it's coming from the lower unit. I'm wondering if the impeller is messed up. It doesn't sound like metal on metal. It almost sounds like the water pump pumping and maybe something hindering it. I forgot to answer one question that was posted concerning the gas tank. It is not the original metal one, it's a 6 gallon standard red plastic one with primer bulb that i've had on it for the 8 years i've owned it. [/QUOTE]
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Engine slows then dies at WOT- 1960 18hp Johnson Seahorse
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