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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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<blockquote data-quote="Edstrossner" data-source="post: 378236" data-attributes="member: 15774"><p>I finally found a1982 35hp head. It looks like the one from the flyer. </p><p>So, I bolted it up to my 2000 25 hp and I was a little disappointed. This motor with the stock head ran at 105psi. The 1982 head ran at 125psi. I had read that guys were getting 150psi with this head. Port timing on these motors must be a bit different . So, I milled the 1982 head and brought the compression up to 145psi and I ran the boat last Wednesday. There was very little difference from the milled stock head verses the milled 1982 head. </p><p>Well that experiment only cost $65, so not much lost, not much gained. </p><p>Next up I have an old friend sending me some 1-1/2" carbs. I'll be trying those and possibly adding some cone spacers to the reed plate. </p><p>Has anyone compared an aluminum prop vs an ss prop?</p></blockquote><p></p>
[QUOTE="Edstrossner, post: 378236, member: 15774"] I finally found a1982 35hp head. It looks like the one from the flyer. So, I bolted it up to my 2000 25 hp and I was a little disappointed. This motor with the stock head ran at 105psi. The 1982 head ran at 125psi. I had read that guys were getting 150psi with this head. Port timing on these motors must be a bit different . So, I milled the 1982 head and brought the compression up to 145psi and I ran the boat last Wednesday. There was very little difference from the milled stock head verses the milled 1982 head. Well that experiment only cost $65, so not much lost, not much gained. Next up I have an old friend sending me some 1-1/2" carbs. I'll be trying those and possibly adding some cone spacers to the reed plate. Has anyone compared an aluminum prop vs an ss prop? [/QUOTE]
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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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