Author Topic: Need help to identify year/mod of 750 frame & engine (Read 1582 times)

GOOSE · « **on:** April 10, 2019, 03:16:27 PM »

Hi all
Im in the process of building up another cb750 but im having trouble identifying the year & model of the frame & engine im sure they arnt from the same model
Frame. CB750-2579924
Engine. CB750E-2469861
I have looked at the vin ID register but uncertain if im reading it right
Can anyone help me out please
Thanks for your time

Bankerdanny · « **Reply #1 on:** April 10, 2019, 06:07:11 PM »

Where are you located? Those numbers say 1977 Australian market bike.

Bodi · « **Reply #2 on:** April 10, 2019, 06:26:44 PM »

I think that's a 1976 Australian K6. The number spread has been reported to be unusually wide on the Australian export bikes, no reason given. It is therefore possible you have the original engine but there's no easy way to tell. If your ownership papers list both numbers (unusual but I don't know what Australia does) you may be able to request an ownership history from the government.
Honda presumably had records of serial numbers and where they were shipped to... if they still have the records I have not heard of anyone getting that data from Honda.

GOOSE · « **Reply #3 on:** April 10, 2019, 06:43:07 PM »

Im in Australia i forgot to say that
Thanks

GOOSE · « **Reply #4 on:** April 10, 2019, 06:46:00 PM »

Ok thanks guys the motor wasnt in the frame ive just picked up a heap of parts & the motor is spose to have an 810 kit in it
Ill be pulling it down to check & rebuild
Thanks for the info

Bankerdanny · « **Reply #5 on:** April 10, 2019, 07:01:04 PM »

Sorry, I only half answered, 1977 CB750K

GOOSE · « **Reply #6 on:** April 10, 2019, 07:12:51 PM »

Ok thanks for that i assume thats the frame?
I was starting to think it was a 76/77 mod frame

BenelliSEI · « **Reply #7 on:** April 10, 2019, 08:00:25 PM »

I’m curious....... If it’s a ‘77 cb750K, does it have a bolt on engine mount (removable) on the front left frame down-tube? It’s a unique feature, to that year, instead of the welded on lug.

GOOSE · « **Reply #8 on:** April 10, 2019, 10:13:27 PM »

Hi im not sure its in a crete at the moment ill double check & get back to you

BenelliSEI · « **Reply #9 on:** April 11, 2019, 05:53:52 AM »

Thanks........ theremovable portion looks like this:

GOOSE · « **Reply #10 on:** April 11, 2019, 06:31:29 AM »

Ok thanks i havnt had time to check yet
But
I had contacted HONDA AUSTRALIA the other day & they got back to me this arvo they tell me by their records its a cb750k6. 76/77 mod
As soon as i get out to the work shop ill check

BenelliSEI · « **Reply #11 on:** April 11, 2019, 02:24:52 PM »

Thanks, appreciate knowing. From my research (not much) that engine mount is only on K7 frames.

Bankerdanny · « **Reply #12 on:** April 11, 2019, 02:53:14 PM »

I don't know about how things worked in Oz, but in the US the 77 bikes had different carbs than the 76 bikes due to changes in US emissions laws. I know that European bikes didn't get some of the changes that US bikes did, so that might apply to Australia too. The carbs have numbers on them, typically on the rack near the #4 carb. Just double check what you have before you order parts.

GOOSE · « **Reply #13 on:** April 11, 2019, 11:27:32 PM »

Hi Bennelli
The mount is welded in

GOOSE · « **Reply #14 on:** April 12, 2019, 03:26:03 AM »

Hi BANKERDANNY its just a bear motor no carbs with it but ive got a few boxes of them from other buy ups ive had

disco · « **Reply #15 on:** April 12, 2019, 03:28:27 AM »

I’m interested to know how you guys can determine that it’s an Australian market bike from the engine & frame number?

Not saying you’re incorrect. Just how do you know that? I’m in Australia and never knew that could be determined from the frame/engine numbers.

Bankerdanny · « **Reply #16 on:** April 12, 2019, 07:31:33 AM »

Quote from: disco on April 12, 2019, 03:28:27 AM

I’m interested to know how you guys can determine that it’s an Australian market bike from the engine & frame number?

Not saying you’re incorrect. Just how do you know that? I’m in Australia and never knew that could be determined from the frame/engine numbers.

If you go to the main SOHC4.net site and click on the model pages to get to the 750 you will find a serial number chart. Here is a link to the 750K chart:

http://www.sohc4.net/cb750k-serial-numbers

Bodi · « **Reply #17 on:** April 12, 2019, 08:49:38 AM »

Registration years can be a year off. The 76 production ended in June 76 but some could have been sold as 77 models.

BenelliSEI · « **Reply #18 on:** April 15, 2019, 06:01:54 AM »

The frame number definitely indicates a 1976 K6. The practice of updating the years when sold happens in Canada too. I have a 1971 Cb750K1 that sold in a Toronto dealership in 1972. Of course, it’s registered as a 1972. One day I will get it fixed......

Bankerdanny · « **Reply #19 on:** April 15, 2019, 12:18:32 PM »

Quote from: BenelliSEI on April 15, 2019, 06:01:54 AM

The frame number definitely indicates a 1976 K6. The practice of updating the years when sold happens in Canada too. I have a 1971 Cb750K1 that sold in a Toronto dealership in 1972. Of course, it’s registered as a 1972. One day I will get it fixed......

The K designation was not used consistently around the world.

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Author Topic: Need help to identify year/mod of 750 frame & engine (Read 1582 times)