Topic: CB750E What the heck does that mean?

[jlh3rd]

CMS  shows that. They're not a bad source for using to figure things out....

[CB750R]

Thanks very much Guys. I needed a cam as the cam that came with the bike was a new race cam with high performance valve springs and performance shims. I just wanted a nice running motorcycle to use on sunny days. Relive the younger days. Haha. I bought a cam from a motorcycle used parts place only to find out it's a 750 cam but for a Hondamatic according to the dimensions I get. If anyone has an idea what I would be up against with a high-performance motor for street use I'd love to hear from you as it seems a waist to have these new parts and not use them.

Looks like you have one of the more mild aftermarket cams. According to web cam and dynoman as per images attached the lift of .340 is a bit higher than a stock cam but should work fine to bolt in as stock cam, the fresh springs will improve things. 

[jlh3rd]

jlh3rd, don't get your shorts in a bind.  It's not personal.  And I've been wrong before and have been called out.....  We are all just trying to help

I'm an original owner F guy that bought the bike in the first few weeks after they hit our shores. I have 6 or 7 reference books and, yes, the references differ. Agreed. However the engines are not all the same. Many changes throughout the 9 years.

I am seriously looking forward to seeing the original F !! I can't get enough of them. My holy grail. Please post it up. Thanks.

I figured out how to get the Honda parts book info. As can be seen this is from the 75 book so there are subsequent books out there that have been updated. Anyone, please take this only for what you see. 

What Don says has a lot of credence to it. Another option considering the repaint and perhaps more changes is that someone simply put a F engine into a K bike as they were doing work to it.


   

here.....no "F" in engine #...just "E"....

and the shop owner says the "F" engine had higher compression due to different pistons than the "K" models..

[ekpent]

The 77-78 F had different pistons.

[newday777]

jlh3rd, don't get your shorts in a bind.  It's not personal.  And I've been wrong before and have been called out.....  We are all just trying to help

I'm an original owner F guy that bought the bike in the first few weeks after they hit our shores. I have 6 or 7 reference books and, yes, the references differ. Agreed. However the engines are not all the same. Many changes throughout the 9 years.

I am seriously looking forward to seeing the original F !! I can't get enough of them. My holy grail. Please post it up. Thanks.

I figured out how to get the Honda parts book info. As can be seen this is from the 75 book so there are subsequent books out there that have been updated. Anyone, please take this only for what you see. 

What Don says has a lot of credence to it. Another option considering the repaint and perhaps more changes is that someone simply put a F engine into a K bike as they were doing work to it.


   

here.....no "F" in engine #...just "E"....

and the shop owner says the "F" engine had higher compression due to different pistons than the "K" models..

If you read through the 750F Supersport  engine and frame list you would see that the sometimes honda put in an E .


Your engine numbers fall in the early 1975 model engine.

CB750F (Supersport) 1975-78 Models
Model   Sell Date   Release Date   Prod. Code   Frame #   Engine #
CB750F0   1975   -   392   CB750F- 1000002   CB750(*)- 2500004
CB750F1   1976   -   392   CB750F- 2000003   CB750(*)- 2515094
CB750F2   1977   -   410   CB750F- 2100011   CB750(*)- 2600004
CB750F3   1978   -   410   CB750F- 2200001   CB750(*)- 3100001
* May Contain F and or E