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SOHC.co.uk Forums => CB500/550 => Topic started by: DarkestCrow on January 08, 2025, 10:30:27 PM

Title: CB 550K3 1978 USA seat cover
Post by: DarkestCrow on January 08, 2025, 10:30:27 PM: I`d like to replace a seat cover on my imported CB550 K3 but couldn`t find any for sale online here in the UK.

It`s a dual seat type year 1978.

I found few for CB750 same year and they look very similar but I couldn`t find any measurements online to compare them.

Can anyone help please?
Title: Re: CB 550K3 1978 USA seat cover
Post by: Bryanj on January 08, 2025, 10:43:46 PM: I think US and UK seat covers are the same just ask for 550K3
Title: Re: CB 550K3 1978 USA seat cover
Post by: DarkestCrow on January 08, 2025, 10:56:34 PM: Mine is a dual seat, there are only the flat ones available online.
Title: Re: CB 550K3 1978 USA seat cover
Post by: Nurse Julie on January 08, 2025, 11:20:59 PM: CB750 seats and covers are different than 550K3.
Title: Re: CB 550K3 1978 USA seat cover
Post by: Bryanj on January 09, 2025, 12:45:16 AM: They are all dual seats
Title: Re: CB 550K3 1978 USA seat cover
Post by: Bryanj on January 09, 2025, 12:49:13 AM: Temporarily out of stock, see attachements
Title: Re: CB 550K3 1978 USA seat cover
Post by: mickwinf on January 09, 2025, 07:57:32 AM: Do you mean the type that steps up at the back, that was USA only for last year of production.also known as a k4, will have to order from an American supplier as I did a few years ago.
Title: Re: CB 550K3 1978 USA seat cover
Post by: Johnny4428 on January 09, 2025, 10:02:08 AM: I agree with the above, donâ€™t think there was any K3â€™s that had the stepped seat.
Title: Re: CB 550K3 1978 USA seat cover
Post by: DarkestCrow on January 09, 2025, 10:23:28 PM: Quote from: mickwinf on January 09, 2025, 07:57:32 AM
Do you mean the type that steps up at the back, that was USA only for last year of production.also known as a k4, will have to order from an American supplier as I did a few years ago.

Yes, stepped seat.

Well mine is apparently K3 manufactured in Nov. 1977 (1978 model) but it also could be a swapped seat from a K4 model?

Can you remember which supplier? What was the quality like?

I just don`t have a good experience with ordering stuff from USA.
Title: Re: CB 550K3 1978 USA seat cover
Post by: Nurse Julie on January 09, 2025, 11:26:01 PM: The stepped seat was only on the 78 model which yours is and was known just as a K model with no number after it. A 77 model (manufactured late 1976) is the K3 that has the normal flat seat. To confirm, your engine and VIN number should be in these range.
frame range CB550K 2100001 - CB550K 2122082
engine range CB550E 2100001 - CB550E 2122090
Title: Re: CB 550K3 1978 USA seat cover
Post by: DarkestCrow on January 10, 2025, 01:29:09 AM: Quote from: Nurse Julie on January 09, 2025, 11:26:01 PM
The stepped seat was only on the 78 model which yours is and was known just as a K model with no number after it. A 77 model (manufactured late 1976) is the K3 that has the normal flat seat. To confirm, your engine and VIN number should be in these range.
frame range CB550K 2100001 - CB550K 2122082
engine range CB550E 2100001 - CB550E 2122090

Okay it makes sense now.

Vehicle dating certificate and V5C both say that it`s a K3 model.

So is there any chance that both stepped seats (1978 CB550 and 1978 CB750) would have the same measurements? Couldn`t find any specs for CB750 online.

Thanks
Title: Re: CB 550K3 1978 USA seat cover
Post by: Bryanj on January 10, 2025, 08:16:31 AM: Very doubtfull as 750 is bigger, you should be able to fit a flat K3 seat if necessary
Title: Re: CB 550K3 1978 USA seat cover
Post by: DarkestCrow on January 12, 2025, 08:39:03 PM: Thank you guys