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    '60s Johnson Evinrude 40 hp compatibility?

    I'm now searching for either a lower unit for my 1963 Big Twin 40 or a running motor for which mine could be a parts motor. Is there a compatibility list somewhere for which Johnson and Evinrude motors are fully or partly interchangeable? Thanks!
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    Big Twin lower Franken-unit damage

    The lower unit on my '63 Big Twin 40 appears to have been originally from an Evinrude (blue paint underneath), then put onto a Johnson (white paint on top), then eventually onto this Evinrude. It does appear to be a fit, however, and for the most part corresponds to what's in my parts catalog...
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    Big Twin leaf plate reassembly

    I disassembled the leaf plate assembly on my '63 40 hp Big Twin so that I could inspect it and also to remove the old gasket material without the risk of damaging the lp valves. It all seems to be in excellent shape. Valves were very flat against the plate and no corrosion. Two questions...
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    '63 Big Twin carb parts question

    I ordered the Sierra 18-7010 carb kit for my 1963 Big Twin 40hp. On the low speed needle valve, my parts catalog shows 2 packing washers (307583) between 2 washers (306027). Are latter nylon? When I took it apart it had only a single piece of packing between 2 nylon washers. Also, what I think...
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    Servicing choke on 1963 Big Twin

    I'm in the process of cleaning and rebuilding the carburetor on my 1963 Evinrude 40 hp Big Twin. Fortunately, I've been able to locate some new parts that have long been "unavailable." I'm wondering about the choke, however. The manual says to inspect the diaphragm for cracks, but can you even...
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    Big Twin 40hp missing locking lever mechansim

    Well, I finally started in working on this old motor today. I have a 1963 Big Twin 40 horse and I figured I'd start with the carburetor. However, in the first phase of disassembly I realized that the entire locking lever mechanism is missing. How important is this? Should I try to find one...
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    Correct oil and lube for 1963 40hp Big Twin

    I've been searching the forum for awhile trying to find what type of motor oil and gear lube I should use with this outboard. I don't have an owner's manual, although I guess that wouldn't list currently available products. Also, I've read a couple of threads about whether or not to mix at 24:1...
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    Cracks in aluminum hull braces

    I'm trying to decide how to repair some cracks in the hull braces on my CL 1960 Flying Crest. These braces are below the front console under a small section of decking where the feet of the driver and front passengers would rest. The first image is a close-up and the arrows indicate the cracks...
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    Gluvit or 5200 for sealing rivets & seams in aluminum hull?

    I've begun removing loose original rivets and replacement pop rivets in my 1960 Crestliner Flying Crest. I'm going to hand buck in new solid rivets in most spots and maybe use a few screws to pull things together in a couple of places. After doing extensive reading in this forum and elsewhere...
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    Replacing rotten floor on aluminum boat

    I'm looking for a little guidance regarding replacing the floor on my old Alumacraft (circa 1960). The floor had been replaced at some point in the last 20 years, I believe, with what appears to be 5/8" treated plywood. The ply was attached with drywall screws to the floor "joists" and...
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    Replace rivets in aluminum hull

    I'm sure this has been covered but I couldn't find anything directly relating to rivet replacement in the titles of search results. I have a 1960 Alumacraft speedboat that is missing a few rivets and has had others replaced with pop rivets. Although I've used a pop rivet tool for lots of...
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    Ethanol-resistant seals, etc?

    Hi- I'm brand new to the forum. I just inherited my family's old, small, aluminum speed boat. When I was a kid it had a long shaft Johnson 40 horse. That was sold at some point and it now has a non-running 35hp Evinrude that I believe is a little older - maybe late 50s? Before I start in on...
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