Topic: Serial numbers - non-US market

[Glenn Stauffer]

I received this message from a fellow SOHC/4'er in Peru:

" have a 1975 CB750Four with the followin serial numbers:
- Serie:  CB-750-2103996
- Engine: CB-750E-2422907
This serial numbers from my bike do not appear in the charts of your page.
Could you give me more information on this regards?"

Anyone know of a good chart that shows these numbers for 1975 CB750K?  Maybe there is one on www.sohc4.net and I've become blind...  It isn't confirmed 100% that the bike is a K model.  I don't have anything on the F numbers for the world market, but if anyone has that data, please let me know.

[HondanutRider]

I'm no expert, but those numbers don't look right to me.  It looks like the motor isn't the original for that frame, maybe not the same year.

[mlinder]

72 frame with 74 engine?

[Glenn Stauffer]

The story with this bike is that it was supposedly imported directly into Peru in 1975 and had one owner until recently.  The engine number is definitely way off.  The frame does not match what I have for the 1975 K or F bikes either.  My data shows the F bikes having frame numbers in this range CB750F-1###### and the K bikes of that year having frame numbers in this range CB750-25#####.  My data only has non-US numbers after 1976.

I agree that it looks like it would be a 1972 frame and a 1974 engine from the info I have.  But, would Honda have sold this combination of components in 1975?  Maybe it was through a Japanese dealership and not really a new bike.  I'll have to get him to send me pictures of the bike.

[bryanj]

Glenn could be like UK where we had the K2 all the wat through to 75 and the numbers just kept going up

[Glenn Stauffer]

I believe you are right about that.  I just put up this page: http://www.sohc4.net/index.php?q=content/cb750-timeline that describes the CB750 model timeline.  The K2 was sold throughout the world until the introduction of the K6.  The K3 was US-only as was the K5 with the K4 selling in Japan and US.  Sounds like the frame number series was by model, not year, but that the engine numbers went by year.

[bryanj]

Similar with the 500 in UK Glenn where the first 550 we had was the K3 along with the F1 whilst you had 550 for a couple of years

[Clyde]

If it was in Australia, I would say it is close to original/correct K2 numbers and probably sold in 12/74.
The K2's continued to be made in most countries other than the US up until 1975. We did not have the K3/K4/K5
The frame numbers continued on into CB750-210****, but the engine numbers were consistent with US engine numbers. Thus the US engine numbering system can be used to date the bike.
If anyone in the US has a similar engine number we could probably date the bike more accurately

[Deltarider]

Similar with the 500 in UK Glenn where the first 550 we had was the K3 along with the F1 whilst you had 550 for a couple of years

Same here on the continent. 1976 built CB500K2's (different from US 500K2, by the way) were sold into 1977!

[mick7504]

I have some numbers here from John Wyatts "Original Honda CB750"

CB750 K4
Release Date 1974 (USA)
Frame - CB750 2300001
Engine - CB750E 2300001

CB750 K5
Release Date 1975 (USA)
Frame - CB750 2500001
Engine - CB750E 2372115

CB750 K6
Release Date 1976
Frame - CB750 2540001
Engine - CB750E 2428762

CB750 K7
Release Date 1977
Frame - CB750 2700009
Engine - CB750E 2700001

CB750 K8
Release Date 1978 (USA)
Frame - CB750 2800001
Engine - CB750E 3000001

CB750 F0
Release Date 1975 (USA)
Frame - CB750E 1000002 - - - The "E" might be a misprint in the book.
Engine - CB750FE 2500004

CB750 F1
Release Date 1976
Frame - CB750F 200003
Engine - CB750FE 2515094

CB750 F2
Release Date 1977 (USA)
Frame - CB750 210011
Engine - CB750FE 2600004

CB750F3
Release Date 1978 (USA)
Frame - CB750E 2200001
Engine - CB750FE 3100001

CB750A (1976)
Release Date 1976
Frame - CB750A 7000001
Engine - CB750AE 7000001

CB750A (1977)
Release Date 1977
Frame - CB750A 7100001
Engine - CB750AE 7100001

CB750A (1978)
Release Date 1978
Frame - CB750A 7200001
Engine - CB750AE 7200001