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Hi,

I just bought a '67 Black Bomber from a nice gentleman in Fort Collins. I live in Colorado Springs. I'm looking for parts 7,8 and 6 ! Any luck?

Best,

Amir
 

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'fraid I can't help with the spring itself (or any of the other bits for that matter), but you might be able to find something similar if you know that it looks like this:


spring-latch_medium77202283010-01_4781.jpg
 

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Is that a generic pic of a spring or the actual spring? My problem is mine is missing and all I have so far are the schematic drawings. I'm also wondering if I can make do with just the knob and simply screw it in ( I see threads on the shaft of the knob). Unless of course the whole purpose of the spring is to actually draw in the know (shown as item #6 above). If that is the case, I don't see why there would be threads on the shaft of the knob.
 

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It's the spring - look closely and you'll see the CMS logo. Click the image and when it zooms in, you'll also be able to read the part number in the top left hand corner. CMS don't have it in stock, but they photograph everything they sell/have sold, so you can be pretty confident its exactly what you're looking for.

Can't help with any explanation for its purpose or how that set up works; you'll need a K0 owner for that. My guess is that it's there to put tension on the knob to stop it backing out under vibration. I suspect this was part of Honda's habit of over-engineering its early generation bikes from around that time (I've written a more detailed explanation of that business practice in another post somewhere). You can probably gauge how essential - or otherwise - it might be by looking at the design changes between the K0-1-2-3 models. But if my hunch is correct, you can almost certainly live without it unless you're going for a concourse rebuild.

I just thought I could find an image that might help.
 

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The outside diameter of the collar (part #8) is sized to fit snugly into the small end of that spring.
 

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The seat bracket can also be bought as a reproduction item via clauss studio at,

https://www.claussstudios.com/store/p220/Honda_CB450_Black_Bomber__1965-67_Seat_Setting_Stay_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.
 

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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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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.

8336E38D-63AA-4190-964F-1451DF98EB44.jpeg

765F9A2F-4819-4E60-B7B3-6D01E76074C4.jpg B468E03C-C1BE-47A0-A72C-28E78FD3012E.jpg 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 :D.

-Isaias
 

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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.

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
4BFB2135-2AB5-4D35-A5D2-D173928A9FC6.jpg

The Side
5455180D-1C40-4C1A-9EE2-2998B9B41826.jpg

The Back
9EB4A572-B833-414F-A190-E2F4AC462F5C.jpg

View of the threads
009B556C-FADA-42DE-84ED-68B97CD9D752.jpg


Measurements:

The outside diameter
7DF252C1-F701-4344-81F3-8B03DFDC7E38.jpg

The inside “lip/collar” diameter
EEAFBFD8-57A4-4769-BA83-D2DDFD81F7E1.jpg

The width (without the collar)
2A2BB0AE-A6E3-4956-B8C1-238EDEA6AFF4.jpg

The width (including the collar)
CA5A9385-3479-4D99-A136-190281D61DC8.jpg

Assembled:
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
 

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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.
IMG_3657.jpg

These came out to $2 for two.
IMG_3663.jpg

Here's the difference in diameter between the two
IMG_3658.jpg

The Hex nut is slightly larger than the inside diameter of the small end of the spring.
IMG_3661.jpg

I threw it on the toy lathe to get the nut to fit into the spring
IMG_3664.jpg 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.
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.
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.
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
IMG_3667.jpg

And here it is with the trimmed down version installed that allows the bolt to "float"
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.
IMG_3673.jpg

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

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
 

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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
 
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