Author Topic: Frame and engine no’s  (Read 2581 times)

Offline badger_eng

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Frame and engine no’s
« on: August 21, 2026, 06:29:42 PM »
Firstly I’ll apologise that I haven’t thoroughly searched the forum before asking the question, it’s been grandchild sitting day today so time has been of a premium.

Does anyone know of a website / resource that gives the year of manufacture of either / both of the engine no. and frame no. to help date and identify the components.

The 1977 Honda CB550K I am waiting on delivery of is advertised as a US spec bike but now UK registered. I’d like to verify the DOB and model type of these resources are available.

For no other reason other than I’m a bit nerdy like that.

Thanks in advance.
Current:-

Suzuki GSX-S1000GX+ - 2026

Suzuki GT500A Cafe style - 1976
https://www.kettleclinic.co.uk/kcforum/viewtopic.php?t=14273

Honda CB550K - 1977 (Winter 2026/27 project)

Offline badger_eng

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Re: Frame and engine no’s
« Reply #1 on: August 21, 2026, 07:33:01 PM »
No need for any follow ups, just received this from owner…

[ Guests cannot view attachments ]

Thanks anyway
Current:-

Suzuki GSX-S1000GX+ - 2026

Suzuki GT500A Cafe style - 1976
https://www.kettleclinic.co.uk/kcforum/viewtopic.php?t=14273

Honda CB550K - 1977 (Winter 2026/27 project)

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
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Re: Frame and engine no’s
« Reply #2 on: August 21, 2026, 08:45:33 PM »
That's the beauty of USA imports, all the info you need is on the data / VIN tag on the steering stem. UK models didn't even get VIN plates until about 1975 and even then the info is limited.
« Last Edit: August 21, 2026, 08:47:18 PM by Nurse Julie »
LINK TO MY EBAY PAGE. As many of you know already, I give discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline McCabe-Thiele (Ted)

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Re: Frame and engine no’s
« Reply #3 on: August 21, 2026, 08:47:12 PM »
If it has an age related registration plate then DVLA must be satisfied about it's age, I believe they add a year so it's always a year newer than the VOSA. Certificate.

If you are really nerdy the VJMC might help, there will be membership fee and a charge for a dating certificate.
Honda CB400NA Superdream (current money puddle)
Honda CB500 K1 (second money pit)
https://www.sohc.co.uk/index.php/topic,28541.0.html
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
This is a neat 500 restoration in the USA.
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline badger_eng

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Re: Frame and engine no’s
« Reply #4 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 😆)
Current:-

Suzuki GSX-S1000GX+ - 2026

Suzuki GT500A Cafe style - 1976
https://www.kettleclinic.co.uk/kcforum/viewtopic.php?t=14273

Honda CB550K - 1977 (Winter 2026/27 project)

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
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Re: Frame and engine no’s
« Reply #5 on: August 21, 2026, 09:15:02 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 😆)
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.
« Last Edit: August 21, 2026, 09:18:27 PM by Nurse Julie »
LINK TO MY EBAY PAGE. As many of you know already, I give discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline badger_eng

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Re: Frame and engine no’s
« Reply #6 on: August 21, 2026, 09:20:04 PM »
Gracias amigo 👍
Current:-

Suzuki GSX-S1000GX+ - 2026

Suzuki GT500A Cafe style - 1976
https://www.kettleclinic.co.uk/kcforum/viewtopic.php?t=14273

Honda CB550K - 1977 (Winter 2026/27 project)

Offline Bryanj

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Re: Frame and engine no’s
« Reply #7 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

Offline badger_eng

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Re: Frame and engine no’s
« Reply #8 on: August 21, 2026, 09:40:22 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

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

Suzuki GSX-S1000GX+ - 2026

Suzuki GT500A Cafe style - 1976
https://www.kettleclinic.co.uk/kcforum/viewtopic.php?t=14273

Honda CB550K - 1977 (Winter 2026/27 project)

Offline Bryanj

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Re: Frame and engine no’s
« Reply #9 on: September 02, 2026, 07:57:45 AM »
Screenshot as promised, sorry for delay, life suddenly got hectic!!

Offline badger_eng

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Re: Frame and engine no’s
« Reply #10 on: September 02, 2026, 01:04:38 PM »
Perfect. Thank you.
Current:-

Suzuki GSX-S1000GX+ - 2026

Suzuki GT500A Cafe style - 1976
https://www.kettleclinic.co.uk/kcforum/viewtopic.php?t=14273

Honda CB550K - 1977 (Winter 2026/27 project)

Offline Bryanj

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Re: Frame and engine no’s
« Reply #11 on: September 02, 2026, 01:39:03 PM »
No problem, bought that book a lot of years ago, cant get one now

Offline badger_eng

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Re: Frame and engine no’s
« Reply #12 on: September 02, 2026, 01:43:47 PM »
Gold dust 👍
Current:-

Suzuki GSX-S1000GX+ - 2026

Suzuki GT500A Cafe style - 1976
https://www.kettleclinic.co.uk/kcforum/viewtopic.php?t=14273

Honda CB550K - 1977 (Winter 2026/27 project)

Offline McCabe-Thiele (Ted)

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Re: Frame and engine no’s
« Reply #13 on: September 02, 2026, 01:55:16 PM »
Hi Bryan, do you have a similar list for the UK 500 K1 that you could post?
Honda CB400NA Superdream (current money puddle)
Honda CB500 K1 (second money pit)
https://www.sohc.co.uk/index.php/topic,28541.0.html
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
This is a neat 500 restoration in the USA.
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline Bryanj

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Re: Frame and engine no’s
« Reply #14 on: September 02, 2026, 03:03:02 PM »
Ted, the UK numbers dont follow the US system, ours were all, officially, K1 whilst they got K0, K1 and K2. Yes i know there are UK reg K0 but they apparently were grey imports from Europe, Honda GB insist the only ones officially here were the press bikes, i have compiled a list of vin to build dates using US Vin tags, i will find that and post it for you