WANTED: CB450K0 "seat spring" part 77203-283-010 - Page 2
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Thread: WANTED: CB450K0 "seat spring" part 77203-283-010

  1. #11
    Senior Member Blue2swing's Avatar
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    The seat bracket can also be bought as a reproduction item via clauss studio at,

    https://www.claussstudios.com/store/...y_Bracket.html

    Or you can find used originals on eBay every now and then from $80-$120 or so.

    Item number 8 I have not been able to find. I’m assuming it’s similar to the side panel bolt spacer. But with flat sides. I’m going to attempt to make my own. It would be nice to have an original around for reference, so I’m still searching for one to purchase. Or if someone here has one that they can share pictures and measurements for, that would also be helpful.

    -Isaias

    Oh yeah, I’m not sure if you were asking where the bolt screwed into. On my bombers the bolt screws into the frame.
    Attached Thumbnails Attached Thumbnails WANTED: CB450K0 "seat spring" part 77203-283-010-c0471cd0-2c30-4bb7-a7e8-257828912737_1575004927626.jpg   WANTED: CB450K0 "seat spring" part 77203-283-010-0f548b45-afcf-4d0e-835f-062c9299c553_1575004971345.jpg  
    asafayan likes this.
    • 1975 CB750 K5 (Brat and loving it, but do miss the smoothness of a stock ride)
    • 1973 CB450 K6 currently being rebuilt.
    • 1967 CB450 K0 Black Bomber. Acquiring parts for rebuild.
    • 1966 CB450 K0 Black Bomber. Acquiring parts for rebuild.


    Still very green and learning. All help is very much appreciate!!

  2. #12
    Senior Member Blue2swing's Avatar
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    Quote Originally Posted by pemdoc65 View Post
    The outside diameter of the collar (part #8) is sized to fit snugly into the small end of that spring.
    Thank you!
    • 1975 CB750 K5 (Brat and loving it, but do miss the smoothness of a stock ride)
    • 1973 CB450 K6 currently being rebuilt.
    • 1967 CB450 K0 Black Bomber. Acquiring parts for rebuild.
    • 1966 CB450 K0 Black Bomber. Acquiring parts for rebuild.


    Still very green and learning. All help is very much appreciate!!

  3. #13
    Member asafayan's Avatar
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    Awesome guys. Just bought the knob and the spring! Just need the collar (part #8) now. Thus far - those are the ONLY missing parts to this bike.

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  5. #14
    Member asafayan's Avatar
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    Hey Isaias,

    If you have luck making item number 8 yourself, I'd be happy to buy one from you!

    Best,

    Amir

  6. #15
    Senior Member Blue2swing's Avatar
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    Quote Originally Posted by asafayan View Post
    Hey Isaias,

    If you have luck making item number 8 yourself, I'd be happy to buy one from you!

    Best,

    Amir
    I’ll give it a shot soon and let you know. If I’m successful I’ll mail one out to you for free.

    I’m a little confused about part #8’s image in the parts manual. One of my bombers came with a full seat latch. However part #8 on my bike looks like someone took a fat washer and forced it passed the threads of the bolt. The neck/collar of the part is tiny. I originally thought the part on my bike was a cheap repair that was done by the previous owner. And, that the “neck/collar” was just the metal of the washer being displaced by a drill bit in an attempt to make the bolt hole larger. However, as I looked online for an image of part #8 all the images matched that of the “fat washer” on my bike and not the image in the parts manual? I guess I do have the piece I was looking for after all.

    WANTED: CB450K0 "seat spring" part 77203-283-010-8336e38d-63aa-4190-964f-1451df98eb44.jpeg

    WANTED: CB450K0 "seat spring" part 77203-283-010-765f9a2f-4819-4e60-b7b3-6d01e76074c4.jpgWANTED: CB450K0 "seat spring" part 77203-283-010-b468e03c-c1be-47a0-a72c-28e78fd3012e.jpgWANTED: CB450K0 "seat spring" part 77203-283-010-153f2fc1-d9f3-4d35-a208-ea588d185fcd.jpg

    I have to say that the function of these pieces leaves a lot to be desired. The whole assembly appears to be very badly designed. And that is not a complaint from me. I’m just surprised to find this assembly to be below Honda’s usual standards. But if that’s how the bike was designed then that’s how I plan to build it .

    -Isaias
    • 1975 CB750 K5 (Brat and loving it, but do miss the smoothness of a stock ride)
    • 1973 CB450 K6 currently being rebuilt.
    • 1967 CB450 K0 Black Bomber. Acquiring parts for rebuild.
    • 1966 CB450 K0 Black Bomber. Acquiring parts for rebuild.


    Still very green and learning. All help is very much appreciate!!

  7. #16
    Senior Member Blue2swing's Avatar
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    So I dug through my boxes of K0 parts to take another look at my warn seat latch assembly. Here is what I found.

    WANTED: CB450K0 "seat spring" part 77203-283-010-27dd84ea-6906-415b-8ed7-fa59969e88f9.jpg

    I DO have part #8 after all! That’s great! I’ve been looking high and low for measurements for this piece. And after repairing the threads of the old bolt it was attached to I was able to take some measurements.

    The part is similar to a washer with internal threadings (M8X1.25) and a small lip/collar that hugs the inside of the smaller end of the spring. It can easily be replaced by a 20mm metal washer and a small nut that fits inside the small end of the spring.

    The Front
    WANTED: CB450K0 "seat spring" part 77203-283-010-4bfb2135-2ab5-4d35-a5d2-d173928a9fc6.jpg

    The Side
    WANTED: CB450K0 "seat spring" part 77203-283-010-5455180d-1c40-4c1a-9ee2-2998b9b41826.jpg

    The Back
    WANTED: CB450K0 "seat spring" part 77203-283-010-9eb4a572-b833-414f-a190-e2f4ac462f5c.jpg

    View of the threads
    WANTED: CB450K0 "seat spring" part 77203-283-010-009b556c-fada-42de-84ed-68b97cd9d752.jpg


    Measurements:

    The outside diameter
    WANTED: CB450K0 "seat spring" part 77203-283-010-7df252c1-f701-4344-81f3-8b03dfdc7e38.jpg

    The inside “lip/collar” diameter
    WANTED: CB450K0 "seat spring" part 77203-283-010-eeafbfd8-57a4-4769-ba83-d2ddfd81f7e1.jpg

    The width (without the collar)
    WANTED: CB450K0 "seat spring" part 77203-283-010-2a2bb0ae-a6e3-4956-b8c1-238edea6aff4.jpg

    The width (including the collar)
    WANTED: CB450K0 "seat spring" part 77203-283-010-ca5a9385-3479-4d99-a136-190281d61dc8.jpg

    Assembled:
    WANTED: CB450K0 "seat spring" part 77203-283-010-164eb31e-c9e3-4d93-996a-35baa7c2739d.jpg

    Ive been searching for this information everywhere. Now that I have it I’m excited to share it. I hope this information helps.

    -Isaias
    • 1975 CB750 K5 (Brat and loving it, but do miss the smoothness of a stock ride)
    • 1973 CB450 K6 currently being rebuilt.
    • 1967 CB450 K0 Black Bomber. Acquiring parts for rebuild.
    • 1966 CB450 K0 Black Bomber. Acquiring parts for rebuild.


    Still very green and learning. All help is very much appreciate!!

  8. #17
    Senior Member Blue2swing's Avatar
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    Hey Amir,

    So, I was leaving Costco today and looked across the parking lot at Lowes and thought, "I wonder if Lowes carries any M8X1.25 fasteners that would be a good equivalent replacement for part#8?" I have a toy lathe, soy I took a look at the 20mm steel rod first. At $17 for 3ft I found that too expensive for such a small part. I say that now, after paying close to $20 for a small spring!! .

    What I ended up going with was 2 M8x1.25 flanged nuts. The flange measures out to 17mm in diameter. 3mm smaller than what I'm looking for, but I believe this will still work.
    WANTED: CB450K0 "seat spring" part 77203-283-010-img_3657.jpg

    These came out to $2 for two.
    WANTED: CB450K0 "seat spring" part 77203-283-010-img_3663.jpg

    Here's the difference in diameter between the two
    WANTED: CB450K0 "seat spring" part 77203-283-010-img_3658.jpg

    The Hex nut is slightly larger than the inside diameter of the small end of the spring.
    WANTED: CB450K0 "seat spring" part 77203-283-010-img_3661.jpg

    I threw it on the toy lathe to get the nut to fit into the spring
    WANTED: CB450K0 "seat spring" part 77203-283-010-img_3664.jpg WANTED: CB450K0 "seat spring" part 77203-283-010-img_3666.jpg

    If you look closely the Honda seat latch knob bolt is different than the reproduction seat latch bolt. There is a flat spot just after the threads that allows part #8 to "float" on the bolt without being worked through the threads. That way Part#8 keeps the bolt from falling out when not screwed into the frame while at the same time not un-threading itself from part#8 when being unscrewed from the frame. However, on the honda part the flat space is about 5mm wide. While on the reproduction part the flat space is only 2.5mm (at least on the one I purchased). This means the widest part#8 can be for my piece is 2.5mm MAX.
    WANTED: CB450K0 "seat spring" part 77203-283-010-img_3672.jpg

    I plan on removing some of the threads at the back of my reproduction latch knob bolt to correct this. However, since I'm planning on sending this part out to Amir I'm assuming his bolt has the same flaw as mine. And in the case that he does not have the tools needed to modify the part as needed I decided to bring down the piece I made to 2.5mm wide in order to allow it to "float" on the reproduction piece as well.
    WANTED: CB450K0 "seat spring" part 77203-283-010-img_3671.jpg

    This brought the part to half the thickness of the original honda part#8 thickness. I'm not too happy about that, but it is what it is.
    WANTED: CB450K0 "seat spring" part 77203-283-010-img_3675.jpg

    Here is my cheap reproduction installed without it being trimmed down to be allowed to "float" on the flat part of the bolt
    WANTED: CB450K0 "seat spring" part 77203-283-010-img_3667.jpg

    And here it is with the trimmed down version installed that allows the bolt to "float"
    WANTED: CB450K0 "seat spring" part 77203-283-010-img_3677.jpg

    I'm only assuming that the longer version will not work as I have not actually tried it out on a bike. My seat is in pieces right now so I don't have a way of testing it at the moment. However, in the case that there is a chance that the longer version will work i will mail Amir both if he wants them.
    WANTED: CB450K0 "seat spring" part 77203-283-010-img_3673.jpg

    Total cost to make these = $2. Not bad, I'm happy with the final product considering the investment.

    Amir, I'll message you directly if you would like for me to mail these out to you. I hope everyone is have a great holiday season.

    -Isaias
    asafayan and Alan F. like this.
    • 1975 CB750 K5 (Brat and loving it, but do miss the smoothness of a stock ride)
    • 1973 CB450 K6 currently being rebuilt.
    • 1967 CB450 K0 Black Bomber. Acquiring parts for rebuild.
    • 1966 CB450 K0 Black Bomber. Acquiring parts for rebuild.


    Still very green and learning. All help is very much appreciate!!

  9. #18
    Supporting Member papabear's Avatar
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    Awesome! Great engineering effort, and a wonderful opportunity to be of help to another vintage bike enthusiast. Well done.
    asafayan and Blue2swing like this.
    1967 CB450 K0
    2007 VTX 1300S
    2013 CB1100

  10. #19
    Member asafayan's Avatar
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    Hi Isaias,

    I'm so new to this forum that I didn't know you had responded to this thread until you sent me the private message. What an impressive effort on your part and it is GREATLY appreciated. And there is no way I'll allow you to mail those to me without re-imbursement. Let me buy you a Amazon gift card or something please. I'll private message you shortly.

    If you are ever in the Colorado Springs area, please look me up.

    Best,

    Amir

  11. #20
    Super Moderator ancientdad's Avatar
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    ^^^that's what this place is all about
    Blue2swing and asafayan like this.
    Tom

    CL450 project reboot, street legal this time
    Budget drag bike project
    CB350K1 full patina project
    Ride along at the drag strip


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

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