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Early 70's 25hp Johnson revs up and loses power
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<blockquote data-quote="Boat2fast" data-source="post: 385855" data-attributes="member: 13358"><p>Sounds to me like a spun prop too. Spun a few myself on those motors. Careful not to over-prop those 25s. They turn 1000 rpm higher than the 18s to make their power. Check Max operating range. Now put a tach on your engine. Full speed rpm should be right near the top of the range.</p><p></p><p>The shift shaft seal is easier to change with the factory tool. Sometimes the dealer has an advantage here. Ask him to install the seal for you.</p></blockquote><p></p>
[QUOTE="Boat2fast, post: 385855, member: 13358"] Sounds to me like a spun prop too. Spun a few myself on those motors. Careful not to over-prop those 25s. They turn 1000 rpm higher than the 18s to make their power. Check Max operating range. Now put a tach on your engine. Full speed rpm should be right near the top of the range. The shift shaft seal is easier to change with the factory tool. Sometimes the dealer has an advantage here. Ask him to install the seal for you. [/QUOTE]
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Early 70's 25hp Johnson revs up and loses power
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