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Swinging Arm Bush appears to be a non standard size, why?

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leadnavel:
I’m a good way through my 750 K7 rebuild and thought that I would replace the bushes for the swinging arm as the end of one of the existing units are a bit knarled (image attached), here’s the problem, the replacement bushes from CMS (part number:52108-457-300) measure up different from my existing bushes! The inside diameter of the new bushes measure 21.80mm, the inside diameter of the old bushes measure between 21.39-21.40mm. In short the new bushes have a larger inside diameter than the old ones, so it’s defo not a ware issue!

I have questioned the part with CMS and they assure me that the correct part has been sent for the K7. I have also measured my existing Center Collar which measures between 21.34-21.38mm at the bush ends. I’ve had the bike since 1983 with very few modifications to it and she’s been off the road since 1986 (27’000 miles on the clock) so very few parts are worn. Does anyone know what’s going on here? Luckily I haven't taken out the old bushes as I would've been right up dump dyke!

Nurse Julie:
Are the ones you received from CMS the original plastic type or the bronze bush replacement type?

Nurse Julie:
Just measured the ID of the bronze Bushes I sell for the 750/4's and its 21.40mm.

leadnavel:

--- Quote from: Nurse Julie on October 12, 2020, 06:03:37 PM ---Are the ones you received from CMS the original plastic type or the bronze bush replacement type?

--- End quote ---

Thank you for your reply Nurse Julie, the parts that I got from CMS are of the plastic type. Can you shed any light as to why my bushes differ from the parts that CMS say are the correct replacements for my K7?

Nurse Julie:

--- Quote from: leadnavel on October 12, 2020, 10:23:25 PM ---
--- Quote from: Nurse Julie on October 12, 2020, 06:03:37 PM ---Are the ones you received from CMS the original plastic type or the bronze bush replacement type?

--- End quote ---

Thank you for your reply Nurse Julie, the parts that I got from CMS are of the plastic type. Can you shed any light as to why my bushes differ from the parts that CMS say are the correct replacements for my K7?

--- End quote ---
Absolutely no idea. What I do know is that the bronze bushes I sell fit the complete CB SOHC/4 range of bikes, including all the 750's K0-K8 and F1/ F2.
Looking at what I can see in your photo, is yours a standard swing arm?

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