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    135 'rude lower unit ratio?

    hey all, I'm away from my seloc manual for the next few days and was wondering if anyone knows the gear ratio in the lower unit for my: 1975 v4 evinrude 135hp or if you can tell me how to look it up onlne, I'd be happy to do my own work :) -peter
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    prop physics, basic question

    new to boating here, but have just enough science knowledge to ask dumb questions... so here's one: last night, I calculated a theoretical speed for a 21 pitch and a 24 pitch prop at 5500rpm. in the idealized world of calculations on a cocktail napkin, it came out to be 109 and 125mph...
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    135hp outboard/advice on coarser pitch

    i spend most of my time on iboats talking and asking about my vintage, 1959 johnson 35hp super seahorse, so i don't get here to the prop forums too often... ...but this is totally different. it relates to my fun boat, a 16' sportster, [looks like a bass boat], with a 135 evinrude on it. this...
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    descaling thermostat housing?

    rds21b '59 super seahorse 35 i have some minor scaling/corrosion on my thermostat housing, [not in the areas swept by the impeller]. for the sake of professionalism and good craftsmanship, I'm interested in cleaning it up a little before I put it back together. i'm not a pro, just a hobbyist...
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    lower unit bolts big twins good idea

    specifically for a '59 rds21b 35hp super seahorse I was going through the lower unit gearcase and munged up the slotted screwdriver headed 1/4-20, stainless bolts. unhappy with the idea of using slotted bolts again, and no telling if they are still available or at what cost. I had an idea. I...
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    galvanic/dissimilar metals corrosion

    i read on here shortly after i joined from some guys who said that stainless bolts will dissimilar metals-corrode more aggressively than stainless ones, in the the aluminum of outboards. i had a hard time believing this when i first read it. but i sure had a tough time removing the lower unit...
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    how to ID a prop?

    merry christmas all! bought a used boat this past fall with small, 16 foot performance hull and an evinrude 135hp. it's been a blast, but the previous owner used it for towing skiers/wakeboarders, so he had put an aluminum "pulling" prop on it. it seems like a pulling prop too because with...
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    prop swap procedure, '75 'rude 135

    ok a break from my deluge of questions about my '59 35hp big twin...:) this time, a question about my '75 evinrude 135hp. only had it for a couple of months, and the guy that sold it to me had a "pulling" prop on it because he towed skiers with it, [lightweight 16 footer]. but when he sold it...
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    '59 35hp thermostat/flushing question big twin

    '59 35hp, rds21b... has a water "riser", with what appears to be the place where the thermostat goes, at the top of the tower. only whoever maintained it before, removed the thermostat. so i have two questions: 1] was it smart to remove the 'stat? seems like maybe not. auto engines wear...
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    ok, i ordered the parts manual, '59 johnson35hp, big twin

    ok, from reading the forums, it's accutely obvious that some of you have some kind of "magic" for knowing parts numbers, and have kindly given me part number info a couple of times. thanks for that. but several other times i've asked for them i've gotten nothing...and that's ok too, because...
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    top oil seal puller?, '59 johnson 35hp, big twin

    my magneto plate is oily, as well as the top area of the motor underneath the magneto plate. makes me think the top seal is leaky. runs fine, though. the seloc manual specifies a puller that i wonder if is still available or if it's a common kind of thing that you might be able to buy at a...
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    '59 35hp exhaust inner cover plate pn's? big twin

    reading the seloc manual for my '59 johnson 35hp, rds21b, and it makes mention of the innner exhaust cover, and how in that era, it's frequently made of aluminum...and that if it's used in salt water, like mine is, it may corrode through. i have no evidence that this has happened to mine in the...
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    big twin engine balance theory?

    regarding big twins, [i have a, '59 35hp rds21b]...as i mentioned in a previous post, i build automotive v8 engines for road racing, [but i'm brand new to outboards], and a thought came to me while reading my seloc manual. in a 4-stroke automotive v8, if a cylinder has a dead misfire, [not...
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    big twin, '59 rds21b 35hp woohoo!!!

    hi all, got this motor along with a boat and trailer back in late may. couple of pics http://lh3.ggpht.com/_mOL8GggZY7w/SH0TifOkyFI/AAAAAAAAAuE/azu7SoHu1S8/011500010205010308200807119a1f0f7721a5af7cb300dec5.jpg and...
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    Big Twin parts sources, compilation?

    Moderators? Any chance of making a sticky? I'm trying to compile a list that can be accessed in one post, or one thread, of folks' favorite parts suppliers for the older big twins, which predate 1968, which is the earliest year that appears on the johnson/evinrude parts web site. So far, I...
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    scored another steal!

    back in early june, i was a non-boater and had never owned one before. then i took a chance and bought a used boat/motor trailer for $900. it was a 13.5 sporty fiberglass hull from around 1960, a span america, with a 1959 35hp johnson "big twin" that runs fantastically. i couldn't believe my...
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    9.9 to 15 easy conversion?

    hi, i have a johnson 9.9, E10RSC. i think it is a 1990. anyway, i _think_ it has the same chassis as the 15hp version of the same year. so i'm wondering if this is one of the ones where a mere swap to the 15hp carburetor will convert it to a 15? i've heard that for some engines, it really is...
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    a moment to gush!

    I spent a long time considering whether to put this in the non-repair thread, but in the end, I figured the Johnny crowd would appreciate it the most. Sorry it's not a repair question or story. I bought a great little vintage sport boat, 14' fiberglass, Span America brand, very curvy and...
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