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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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<blockquote data-quote="user 12972" data-source="post: 333802" data-attributes="member: 12972"><p>After doing a fair amount of part number cross referencing, it appears the 30 and 35 hp motors in 1984 used identical intakes, reeds, carbs, low speed needles, and high speed orifices. Even identical pistons, rods, and cranks. So how did they manage to get another 5 hp from one to the other? I noticed on boats.net that two different high speed orifices were used in both motors, a 61D and a 63D but it didn't clarify where/when they were used. Part numbers are 0319907 and 0328544 respectively. I can only assume one is slightly larger than the other, is it safe to assume the 63 would be larger, or do they follow drill bit sizes and therefore be the smaller? I'm gonna have to pull mine out and see what's installed.</p></blockquote><p></p>
[QUOTE="user 12972, post: 333802, member: 12972"] After doing a fair amount of part number cross referencing, it appears the 30 and 35 hp motors in 1984 used identical intakes, reeds, carbs, low speed needles, and high speed orifices. Even identical pistons, rods, and cranks. So how did they manage to get another 5 hp from one to the other? I noticed on boats.net that two different high speed orifices were used in both motors, a 61D and a 63D but it didn't clarify where/when they were used. Part numbers are 0319907 and 0328544 respectively. I can only assume one is slightly larger than the other, is it safe to assume the 63 would be larger, or do they follow drill bit sizes and therefore be the smaller? I'm gonna have to pull mine out and see what's installed. [/QUOTE]
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1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
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