Author Topic: What have I got?  (Read 403 times)

Offline Mariner Wayne

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What have I got?
« on: January 24, 2022, 06:18:19 PM »
Hi, Can anyone please advise / help identify what bike I actually have.
I thought (hoped) I had a 1978 550 K3. The bike wasn't identifiable when I purchased it some years ago.
Since embarking on the rebuild I have discovered it has F carbs and now I have found it has F front forks as well.
It has an engine no CB550E 2022251 and a chasis no CB550K 2021517
How can I confirm the model from this info?
Thanks

Offline Oddjob

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Re: What have I got?
« Reply #1 on: January 24, 2022, 06:37:49 PM »
The K3 shares a LOT of parts from the F model, especially the F2. if I remember correctly the forks are the same part numbers as the F2.

It's quite common for the carbs to get changed to the F carbs as the standard PD carbs are a nightmare.

Quick way of identifying a K3 from an F is the swinging arm, if it has removable bungs on the end it's a K3, if the ends are closed it's an F. This was because the K3 got 4 exhausts and you couldn't get the rear wheel spindle out so they fitted ends that detached so the wheel came out backwards.
Don't play stupid with me, I'm better at it

Offline Nurse Julie

  • 1973 CB750 UK K2.1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1
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Re: What have I got?
« Reply #2 on: January 24, 2022, 08:55:50 PM »
Hi Wayne. My 550 Mongrel, Millie, has a K3 frame and that has a 20*****VIN. Mind you, that is about the only part that is K3 😂😂😂😂 Oh, maybe the forks are K3 🤔🤔🤔

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Offline Oddjob

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Re: What have I got?
« Reply #3 on: January 24, 2022, 11:34:11 PM »
Another clue, just remembered the rear brake lever is flat on the F but round on the K.
Don't play stupid with me, I'm better at it

Offline deltarider

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Re: What have I got?
« Reply #4 on: January 25, 2022, 11:30:28 AM »
Hi, Can anyone please advise / help identify what bike I actually have.
It has an engine no CB550E 2022251 and a chasis no CB550K 2021517
How can I confirm the model from this info?
P.4 will give a clue: https://www.honda4fun.com/dwnload/Part-List/CB500/CB500-K3-CB550-K3-K4-Parts-List.pdf Is the speedometer in miles (DM) or in kilometers (DK)?
« Last Edit: January 25, 2022, 12:03:59 PM by deltarider »

Offline Seabeowner

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Re: What have I got?
« Reply #5 on: January 25, 2022, 07:01:51 PM »
Simples. My F is stamped CB550F xxxxxx and the K is stamped CB550K xxxxxx.
Phil
1971  CB500K0  Candy Jade Green
1973  CB500K1  Candy Ruby Red
1975  CB550F1   Shiny Orange
1978  CB550K     Excel Black

Offline Mariner Wayne

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Re: What have I got?
« Reply #6 on: January 26, 2022, 07:30:39 PM »
Thanks to everyone for their replies, much appreciated. I think I know what the score is.
I do have a K3. It has F type carbs fitted by persons unknown.
The forks internals are the same as the F type, contrary to the Haynes and Clymer workshop manuals. However, a later version of the parts list for the K3 shows the same fork internals as mine. I therefore think that Honda changed the K3 fork design to the same as the F type after July 1977 (the issue date of the manuals I have).
I think this explains it and I'm happy to believe this.
The forks are the same externally by the way, the earlier K3 design has a central rod through the centre of the spring, the F type does not.
Nurse Julie, mongrel Millie looks very nice and I bet barks very loud as well.
Thanks to all
Mariner Wayne 

 

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