My CB/CL/SL 175 resurrection project
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Thread: My CB/CL/SL 175 resurrection project

  1. #1
    Senior Member Richard_Pitman's Avatar
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    My CB/CL/SL 175 resurrection project

    I thought I'd better start a new thread, both to avoid confusion, and to motivate me to get on with it.

    As I mentioned in another thread, I have accumulated nearly enough spare 175 bits to put another bike together. And as I'm starting from a pile of unrelated parts, rather than desecrating an existing bike, I have no qualms about building something that may indeed turn out to be my very own 'brat' bike !

    What I think I'm aiming to do is to convert my heap of bits into something resembling an SL175 !

    My CB/CL/SL 175 resurrection project-sl1752.jpg

    I just needed to source a few of the parts that I'm missing, and can't fabricate myself. So, yesterday, a box arrived containing a CB175 swing arm, CB200 swing arm pivot bolt, CB175 rear footpeg / exhaust mount brackets and chain adjusters.

    The swing arm bushes were rusted solid, completely seized, so first task was to extract them, using a piece of M10 stud, some M10 nuts, a 1/2" drive 13mm socket and a 19mm socket. Good soak in GT85 ( like WD40 but smells nicer ), and out they came, after using quite a bit of force, some creaking and cracking noises as the rust lost its hold.

    Rust removed and bushes bores cleaned up, all fits together nice and freely now, most satisfying.

    My CB/CL/SL 175 resurrection project-20190809_122150.jpg My CB/CL/SL 175 resurrection project-20190809_122302.jpg My CB/CL/SL 175 resurrection project-20190809_122030.jpg
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet
    1970 - 1972 Random heap of CB/CL/SL 175 parts, slowly being reassembled ..

  2. #2
    Senior Member ancientdad's Avatar
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    Excellent idea Richard - the SL175 has a place in my heart as it was my first brand new bike when I was 15. Looking forward to watching your project come together.
    Tom

    Ride along at the drag strip - https://www.youtube.com/watch?v=20jFPazXlvU



    running points... because I'm too old for mysteries that begin with pushing

  3. #3
    Senior Member bradalden's Avatar
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    Richard, the SL's were my favorite models. I look forward to your build. best of luck.
    CT70 Gone but not forgotten
    1971 CL175 Current project

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  5. #4
    Junior Member Bizav's Avatar
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    Cheers to you for not chopping up a survivor! Looking forward to the updates- best of luck with the build.

  6. #5
    Senior Member ancientdad's Avatar
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    Quote Originally Posted by Bizav View Post
    Cheers to you for not chopping up a survivor! Looking forward to the updates- best of luck with the build.
    Chopping up bikes is not in Richard's DNA... he is a staunch supporter of keeping vintage bikes complete and unmolested - and kudos to him for it
    Tom

    Ride along at the drag strip - https://www.youtube.com/watch?v=20jFPazXlvU



    running points... because I'm too old for mysteries that begin with pushing

  7. #6
    Senior Member Richard_Pitman's Avatar
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    Dogs barking, courier in front porch, CD250u fork legs arrived !

    I have a CB200 top yoke, and a CB175K4 bottom yoke already, so top end sorted, it's how the wheel and front brake will fit is the next puzzle. However, Simo has already done this conversion, so it is clearly feasible.

    I hope ….
    I-Ride-A-ホンダ likes this.
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet
    1970 - 1972 Random heap of CB/CL/SL 175 parts, slowly being reassembled ..

  8. #7
    Senior Member Richard_Pitman's Avatar
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    Down to the garage this afternoon, after watching the MotoGP qualifying sessions.

    The CD250u fork stanchions are in good condition, no rust or pitting, chromed all the way up, unlike the 175 forks. Seals are weeping, but I have a new set to go in. The forks fit into my yokes nicely, and protrude 40mm through the top yoke before contact with the handlebars, so that should take care of the extra length OK.

    My CB/CL/SL 175 resurrection project-20190810_160831.jpg

    Front wheel fits nicely, and it looks as though the stock spacer will be the correct length. Only place I could find one was in the USA, so ordered placed at pathetic UKP to USD exchange rate. I have a relative with a large machine shop, but I don't like to impose on him, working hard to earn a living and keeping shop going.

    My CB/CL/SL 175 resurrection project-20190810_160736.jpg My CB/CL/SL 175 resurrection project-20190810_160724.jpg

    Looks as though someone at Honda had standardisation in mind, even the mudguard (fender ) mounts align correctly.

    My CB/CL/SL 175 resurrection project-20190810_160852.jpg

    Top brake caliper mounting point will work out well as a mount for the brake plate torque arm, just needs a small spacer to get it to align. Fork bottoms will get a coat of silver paint whilst apart for new seals, and I'll probably cut off the redundant parts of the caliper mount.

    My CB/CL/SL 175 resurrection project-20190810_160814.jpg

    It occurs to me that these forks might be an option for a CB200 owner wishing to change the mechanical caliper to a hydraulic one.

    I measured the 250 and 175 fork bottoms, to check that spacer would be correct size.

    My CB/CL/SL 175 resurrection project-20190810_161629.jpg My CB/CL/SL 175 resurrection project-20190810_161652.jpg

    250 fork bottoms, 33.09 + 35.99 = 69.08mm

    My CB/CL/SL 175 resurrection project-20190810_161749.jpg

    175 bottoms both the same. 34.13 x 2 = 68.26mm

    I think I can safely put the 0.82mm difference down to measuring error …….
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet
    1970 - 1972 Random heap of CB/CL/SL 175 parts, slowly being reassembled ..

  9. #8
    Senior Member Richard_Pitman's Avatar
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    I probably won't use the fender mounts on the fork legs, although I might make a fork brace, fitted to them. Odd that the real SL175 doesn't have a fork brace as standard.

    I was trying to figure out how to mount an off road fender to the bottom yoke, and the only thing I could think of would be a crude bracket bolted to the lower pinch bolts. I assumed that the real SL175 would have a special bottom yoke with tapped mounting holes for the fender.

    Imagine my surprise when checking the parts fiches. Honda just used 'a crude bracket bolted to the lower pinch bolts' ! Looks easy enough to copy something usable, just need to source a generic fibreglass fender.

    My CB/CL/SL 175 resurrection project-bracket.jpg My CB/CL/SL 175 resurrection project-front-fender.jpg

    Here's some pics of PO's modifications / 'repairs' to the frame I'm going to use. The side stand bracket isn't actually such a bad idea, as this bike won't have a centre stand or CB style exhaust pipes.

    My CB/CL/SL 175 resurrection project-20190810_161910.jpg My CB/CL/SL 175 resurrection project-20190810_161931.jpg
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet
    1970 - 1972 Random heap of CB/CL/SL 175 parts, slowly being reassembled ..

  10. #9
    Senior Member the-chauffeur's Avatar
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    I'm guessing you've already thought of this, but I suspect the original fender has some supporting hardware built into it that the bolts that hold the bracket in place pass through. Chances are it's only a couple of thin metal plate strips to spread the load, but yeah, it's pretty rudimentary.

    Contrast that to the belt-and-braces set up on the SL350 K0, which has a steel guard, with a steel frame. No fork brace, but with that much steel up front, it doesn't really need it. I guess Honda learned by the time they started putting out the small capacity machines that as well as doing pretty much the same job, fibreglass is both considerably lighter and cheaper than steel . . .
    CL77 (1966)
    CA77 (1966)
    SL350 K0 (1969)

    SL350 K2 (1971)
    CB450 K6 (1972)
    CB750 K2 (1972)

  11. #10
    Senior Member Richard_Pitman's Avatar
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    Quick dry build today, sorting out which little odds and ends I need to source or make.

    Front brake torque arm found in my box of bits, not a 175 part, but does the job, attached to remaining caliper mount using a bolt and spacer, not shown in this photo taken this morning, torque arm at better angle now.

    My CB/CL/SL 175 resurrection project-20190813_103043.jpg
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet
    1970 - 1972 Random heap of CB/CL/SL 175 parts, slowly being reassembled ..

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