SOHC.co.uk Forums > CB500/550

Frame and engine no’s

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Nurse Julie:

--- Quote from: badger_eng on August 21, 2026, 09:11:27 PM ---Thanks for the folllow ups. The image is actually a letter from the VJMC to the previous previous owner.
The previous owner (who I’ve bought the bike off) just sent me the letter via WhatsApp along with a pic of the VIN plate.

I made the mistake of asking here first before asking the vendor.

Thanks anyway.

Looks like it’s a 1977 550K US spec. However it’s painted in 1977 UK spec Candy Sword Blue if I’ve done my research correctly (Not for long tho 😆)

--- End quote ---
Candy Sword Blue is a CB550 F2 model colour, not a CB550 K model colour. Or, the CB550F1 came in Flake Sapphire blue, but with no stripes on the tank.

badger_eng:
Gracias amigo 👍

Bryanj:
I have a good list for 500 and early us 550 but didnt go as far as K3.

One thing i found was that all at the same time Honda were building
CB500K1 FOR UK
CB500K2 FORUSA
CB550K0 FOR USA

This confuses the 500 frame numbers somewhat as numbers that should be early according to US literature arnt.
I can do a screenshot of the 550 page from my id book if you want

badger_eng:

--- Quote from: Bryanj on August 21, 2026, 09:34:25 PM ---I have a good list for 500 and early us 550 but didnt go as far as K3.

One thing i found was that all at the same time Honda were building
CB500K1 FOR UK
CB500K2 FORUSA
CB550K0 FOR USA

This confuses the 500 frame numbers somewhat as numbers that should be early according to US literature arnt.
I can do a screenshot of the 550 page from my id book if you want

--- End quote ---

Thanks Bryan. That would be great when you have the time. No rush 👍

Bryanj:
Screenshot as promised, sorry for delay, life suddenly got hectic!!

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