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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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<blockquote data-quote="Boat2fast" data-source="post: 343130" data-attributes="member: 13358"><p>Okay I get the picture. Look for a 28HP SPL late 1980s-97. These engines had the largest carb that the small port block could reasonably use. If you have nice deep pockets, buy a new one if you can find one. Make sure you linkage is correct and the engine is timed to spec. You can cheat 1 or 2 degrees on the timing.</p><p></p><p> Prop selection really makes a difference. Check with a tach at full throttle-light load. 5500 is max(published) but keep it under 5800. Find the right pitch prop to do this. This will give the best balance of holeshot/top speed/weight carrying. If you carry a spare, make it one size smaller for real heavy loads, pulling water toys etc.</p><p></p><p>That will achieve most of what you can wring out of a 25.</p></blockquote><p></p>
[QUOTE="Boat2fast, post: 343130, member: 13358"] Okay I get the picture. Look for a 28HP SPL late 1980s-97. These engines had the largest carb that the small port block could reasonably use. If you have nice deep pockets, buy a new one if you can find one. Make sure you linkage is correct and the engine is timed to spec. You can cheat 1 or 2 degrees on the timing. Prop selection really makes a difference. Check with a tach at full throttle-light load. 5500 is max(published) but keep it under 5800. Find the right pitch prop to do this. This will give the best balance of holeshot/top speed/weight carrying. If you carry a spare, make it one size smaller for real heavy loads, pulling water toys etc. That will achieve most of what you can wring out of a 25. [/QUOTE]
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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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