Topic: 750 engine number confusion

[fmctm1sw]

Not that it should be the most important thing to me but my engine number is CB750E-2520720.  I don't see that anywhere in this handy chart:  http://hondachopper.com/modifications.html
No 25 anything for that matter...

Ah crap.  Nevermind.  Probably in the same line as 2470427 (K6 I guess)

[mystic_1]

Sounds right to me.  The numbers on that chart are read as "Change applies to this engine number and later."


mystic_1

[Kevin D]

Any chance there is an "F" tucked in there somewhere??:

About the CB750F
Serial Numbers
Model Year     Frame #                      Engine #
750F0           1975 CB750F-1000002 - CB750FE-2500004 -
750F'76         1976 CB750F-2000003 - CB750FE-2515094 -
750F'77         1977 CB750F-2100011 - CB750FE-2600004 -
750F'78         1978 CB750F-2200001 - CB750FE-3100001 -

[fmctm1sw]

Any chance there is an "F" tucked in there somewhere??:

About the CB750F
Serial Numbers
Model Year     Frame #                      Engine #
750F0           1975 CB750F-1000002 - CB750FE-2500004 -
750F'76         1976 CB750F-2000003 - CB750FE-2515094 -
750F'77         1977 CB750F-2100011 - CB750FE-2600004 -
750F'78         1978 CB750F-2200001 - CB750FE-3100001 -

Yeah, I did look real close.  No "F" in there for sure...

[MCRider]

Not that it should be the most important thing to me but my engine number is CB750E-2520720.  I don't see that anywhere in this handy chart:  http://hondachopper.com/modifications.html
No 25 anything for that matter...

Ah crap.  Nevermind.  Probably in the same line as 2470427 (K6 I guess)

Any possibility the cases were replaced? I think fresh cases from Honda don't have a number on them. Then a safe area would be chosen to stamp a number since it is virtually meaningless anyway. That is it is not a legal identifier for registration purposes, but we use it for modification purposes.

THis is simply a WAG. What does your frame say it is, just curious.

[fmctm1sw]

THis is simply a WAG. What does your frame say it is, just curious.

My frame is:  CB750-2331942.

[bryanj]

1974 frame
1976 engine

[MCRider]

THis is simply a WAG. What does your frame say it is, just curious.

My frame is:  CB750-2331942.

According to "The Restorers Guide to K and F Series" by John Wyatt, that puts your chasis as a K4, offered in 1974, though some may be titled 1975. K5s start at frame number 2500001.

The engine number is likely a K6, they start at 2428762 and K7 starts at 2700001. Seems a pretty broad range there... still Likely a K6.

FYI: Engine modifications did not always occur at model change points. Some could be mid-model run.

[tbpmusic]

That is it is not a legal identifier for registration purposes, but we use it for modification purposes.

There are states that use the engine number for Title purposes.
I think Wisconsin is one of them, from what I've been told - of course that's anectdotal information.

bill2

[MCRider]

That is it is not a legal identifier for registration purposes, but we use it for modification purposes.

There are states that use the engine number for Title purposes.
I think Wisconsin is one of them, from what I've been told - of course that's anectdotal information.

bill2

That would be problematical for some, not for us Hoosiers. Likely those records could be updated if necessary.