Topic: CB550 Carb question (Keihin 627B)

[Kenzo1979]

Oh and back to the wire harness… is it a 500 wire harness?  You claim your bike is a 500 with a 550 engine, but is anything else 550’d besides the engine…handle bar controls, front turn signals (dual element-riding lights), the electrical panel itself?  If so, there were differences that could impact the harness.


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[Kenzo1979]

Ok, I guess I can understand that.  But I find that brace to be comforting.  You can probably find another fender from a member or on eBay, etc. pretty easily if you want it on there.  I also like the way it holds my speedo cable and brake line.


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Yea, honestly I would kind of like to have the fender back on it especially if it's important for the 'stability' of the bike at higher speeds...

There are about $160 for reproduction fender on eBay plus 80 for shipping. Not sure that is worth it for me or not. I could try to straighten out the old one I guess or look for one of these so-called fork braces?

I had to zip tie the brake line in lieu of the fender holding it, not an ideal solution.

Start a post on the “parts wanted” section.  Even if people don’t have what you’re looking for, you’ll find members to be very helpful in trying to point you in the right direction.


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[TBarr]

Oh and back to the wire harness… is it a 500 wire harness?  You claim your bike is a 500 with a 550 engine, but is anything else 550’d besides the engine…handle bar controls, front turn signals (dual element-riding lights), the electrical panel itself?  If so, there were differences that could impact the harness.


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I bought the harness for the 500. As far as I can tell they didn't change much else, but I'm not 100% sure about the electrical panel, the panel like I said was largely bypassed in the wiring job they did, so I would be surprised if it was replaced. The handlebar controls are definitely from a 500 as I replaced the original with an aftermarket 500 kit since they were busted. I have no front turn signals (wouldn't mind adding some at some point).

[Kenzo1979]

Can you post a picture of your electrical panel?


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[amitr0]

This is the kit for the 627B from 4into1, but again, I cannot attest to the accuracy or quality.


https://4into1.com/ultimate-carburetor-repair-kit-honda-cb500k-1971-1973/


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For what it matters, I have a '56 550K, US model almost all stock, and recently tried overhauling the carbs for the same reason as OP. I got the corresponding kit from 4into1 and the first thing I noticed was that the drain screw didn't fit the bowls.

This is the second time I go something from 4into1 and it didn't fit my stock bike, the other time was about engine casing bolts, none of them were even the right sizes, and then i went back and checked, in the fine print they had written 'some of these might not fit your motorcycle' in the posting itself.

I don't think I will give 4into1 a third chance after these two encounters.

Lessons learnt : Not to throw away anything before actually installing the aftermarket replacements, no matter how badly damaged they look.

[TBarr]

Can you post a picture of your electrical panel?


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[Kenzo1979]

Well that’s a 550 panel.  Pretty sure none of the 500’s had the 3 fuse setup.  Just 1 inline 15A fuse under a plastic barrel enclosure.  Not that they were extremely different, but there can be some differences. I honestly can’t tell from the picture what would be different though.


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[TBarr]

Well that’s a 550 panel.  Pretty sure none of the 500’s had the 3 fuse setup.  Just 1 inline 15A fuse under a plastic barrel enclosure.  Not that they were extremely different, but there can be some differences. I honestly can’t tell from the picture what would be different though.


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Interesting, I wonder why they put it on but didn't really wire it up...

It seems like fixing the wiring is gonna be a pretty big pain. Redoing everything will likely take me a couple of days if not more if I run into issues with compatibility. Is there some type of quick fix maybe that I can put in a fuse or two in the circuit for safety sake?

[bryanj]

It has a very cheap cicular flasher can hanging below the rubber the " us normal" rectangular one fits and i think the original type starter safety circuit box is what should be above the fuse box which is missing its lid.
The 500 only ever had a single fuse

[Kenzo1979]

Yeah, for basic protection splice a 15A fuse in the red wire going from Battery Positive to the Electrical Panel Connector that feeds the Ignition Key Switch. 

Check the wiring diagram:

http://manuals.sohc4.net/cb500/technical_reference/WD500C.pdf


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