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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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<blockquote data-quote="Johny25" data-source="post: 248314" data-attributes="member: 7791"><p>Ok update to this thread because I hate threads that do not finish. I received and installed my new primer assembly yesterday, got my 88' service manual also yesterday and did a correct link n sync on the motor. I also replaced the thermostat but I don't believe this was part of the issue I had with the motor. The thermostat was more of a precautionary measure. Anyway I took it out on the lake with my 3 yr old today and the motor ran like a swiss watch <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> The only problem I had was the RPM got to high with the light load and the 10.25X11 pitch SS prop. Good thing I picked up a 10X13 the other day, so I went to shore and put the 10X13 on and no more over rev. I lost a lot of holeshot but gained top end and motor didn't rev to high. I was really surprised at the difference in holeshot from my Stainless 11 pitch to the aluminum 13 pitch! It was very noticeable. I am wondering how much it has to do with the cupping on the nice stainless prop? I am going to run my 11 pitch aluminum now and see what the difference is compared to the 11 pitch stainless. Anyway that is my update <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Johny25, post: 248314, member: 7791"] Ok update to this thread because I hate threads that do not finish. I received and installed my new primer assembly yesterday, got my 88' service manual also yesterday and did a correct link n sync on the motor. I also replaced the thermostat but I don't believe this was part of the issue I had with the motor. The thermostat was more of a precautionary measure. Anyway I took it out on the lake with my 3 yr old today and the motor ran like a swiss watch :) The only problem I had was the RPM got to high with the light load and the 10.25X11 pitch SS prop. Good thing I picked up a 10X13 the other day, so I went to shore and put the 10X13 on and no more over rev. I lost a lot of holeshot but gained top end and motor didn't rev to high. I was really surprised at the difference in holeshot from my Stainless 11 pitch to the aluminum 13 pitch! It was very noticeable. I am wondering how much it has to do with the cupping on the nice stainless prop? I am going to run my 11 pitch aluminum now and see what the difference is compared to the 11 pitch stainless. Anyway that is my update :) [/QUOTE]
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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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