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Early 70's 25hp Johnson revs up and loses power
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<blockquote data-quote="eric.schimmel" data-source="post: 385564" data-attributes="member: 12326"><p>Hey everyone, </p><p></p><p>I've stalked these forums for a long time but have never taken the opportunity to post. First off I'll start with a little about the boat. It's a mid 50's ouachita 1448. I recently upgraded the 7.5hp Johnson I had for an early 70's Johnson 25hp. It runs fine most of the time but I have been having an issue sometimes while running at speed. It'll get up and go, usually cruising about 22-23mph then out of no where the rpms sound like they skyrocket and it loses power and runs about 14mph. If I slow down a few times it tends to fix the issue but this last time out, it was happening more often than I would like. I took a video of it and I'm hoping you can help. Also, the carb, fuel pump and impeller have all been rebuilt. I thought it might be cavitation but the cavitation plate sits level with the bottom of the boat and it has a hydrofoil so I'm pretty sure it's not the issue. </p><p></p><p>https://youtu.be/mLiollcmu1I</p><p></p><p>Any help you could give me would be greatly appreciated. Thanks!</p></blockquote><p></p>
[QUOTE="eric.schimmel, post: 385564, member: 12326"] Hey everyone, I've stalked these forums for a long time but have never taken the opportunity to post. First off I'll start with a little about the boat. It's a mid 50's ouachita 1448. I recently upgraded the 7.5hp Johnson I had for an early 70's Johnson 25hp. It runs fine most of the time but I have been having an issue sometimes while running at speed. It'll get up and go, usually cruising about 22-23mph then out of no where the rpms sound like they skyrocket and it loses power and runs about 14mph. If I slow down a few times it tends to fix the issue but this last time out, it was happening more often than I would like. I took a video of it and I'm hoping you can help. Also, the carb, fuel pump and impeller have all been rebuilt. I thought it might be cavitation but the cavitation plate sits level with the bottom of the boat and it has a hydrofoil so I'm pretty sure it's not the issue. https://youtu.be/mLiollcmu1I Any help you could give me would be greatly appreciated. Thanks! [/QUOTE]
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Early 70's 25hp Johnson revs up and loses power
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