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Early 70's 25hp Johnson revs up and loses power
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<blockquote data-quote="KMixson" data-source="post: 385687" data-attributes="member: 432"><p>Spun prop? The spline portion of your prop has a rubber interface between it and the actual prop. The rubber portion breaks and the prop is then able to spin around the spline mounted on the output shaft. At low speeds the resistance was enough to turn the prop until it hit its break loose point. Then the engine revs up but the prop does not turn as fast as the output shaft turns. The more it happens the worse it is going to get. If you over rev the the output shaft you may damage the shaft seal and then water will get into your lower unit. You should not be able to spin your prop on the inner splined portion by hand. The rubber is there in case you hit something with your prop to break the rubber interface before it damages your motor or lower unit too badly.</p></blockquote><p></p>
[QUOTE="KMixson, post: 385687, member: 432"] Spun prop? The spline portion of your prop has a rubber interface between it and the actual prop. The rubber portion breaks and the prop is then able to spin around the spline mounted on the output shaft. At low speeds the resistance was enough to turn the prop until it hit its break loose point. Then the engine revs up but the prop does not turn as fast as the output shaft turns. The more it happens the worse it is going to get. If you over rev the the output shaft you may damage the shaft seal and then water will get into your lower unit. You should not be able to spin your prop on the inner splined portion by hand. The rubber is there in case you hit something with your prop to break the rubber interface before it damages your motor or lower unit too badly. [/QUOTE]
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Early 70's 25hp Johnson revs up and loses power
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