Topic: 750-4 production figures

[HonderCB]

I feel so proud to own ONE of the 35,000 750k5

Yes, the second rarest model after the Sandcasts.

Actually, the 750A2 is the rarest, followed by the 750A1 and then the 750A.  Next came the sandcast, then the 750K5

The total production number of CB750A is about 26.000 bikes!
http://forums.sohc4.net/index.php?topic=106428.0

Not according to the table everyone is referencing in this thread...

CB750 A 4,100
CB750 A1 2,300
CB750 A2 1,700

http://www.sohc4.net/index.php/cb750kproductionnumbers/

[Rockin Roger]

I've just completed the article on SOHC Honda 750-4s which started this thread.

The assistance from people on this list has been nothing short of phenomenal - 'really couldn't have written it without their contributions and leads generated.

I'm not sure which issue of Cafe Racer Magazine the article will appear in, that's up to editorial.

I've given full credit to this list in the piece.
A very sincere thank you to all of you.

Roger Kirwin

[DJ_AX]

SWEET! ... Looking forward to checking it out!

[Schnell]

I've just completed the article on SOHC Honda 750-4s which started this thread.

The assistance from people on this list has been nothing short of phenomenal - 'really couldn't have written it without their contributions and leads generated.

I'm not sure which issue of Cafe Racer Magazine the article will appear in, that's up to editorial.

I've given full credit to this list in the piece.
A very sincere thank you to all of you.

Roger Kirwin

Be really appreciative and post it here.

[Rockin Roger]

Cafe Racer Magazine Feb / Mar 2013 issue has the piece I wrote on the CB750 (SOHC) 4s.
My thanks again to the contributors from this list.
Roger

[Elan]

cool!

[Cabilao]

nice article

[HondaMan]

Here's the Dunstall exhaust Hondaman mentioned:


And here's the Dunstall CB750


Scott

I gotta go find that mag and read the article (above thread).

Now, for the big question: if we could find someone who can make some Dunstall-like pipes for our beloved SOHC4s, who might be interested today? Hmmm...

[Swoop]

Were there not two different styles of Dunstall headers?
I have a set .....with a kind of banana shaped collector, where the four pipies go into....I think there was another style as well. which one is the one in the article?

Steve

[HondaMan]

Were there not two different styles of Dunstall headers?
I have a set .....with a kind of banana shaped collector, where the four pipies go into....I think there was another style as well. which one is the one in the article?

Steve

I remember the earliest ones, in a Cycle Mag article, where that curved pipe was a straight-across box-like affair. It blocked the oil plug, said the article. The two inner pipes also, IIRC, curved toward the outer ones, entering the box at an angle. It looked expensive to make, and I surmised the later style was easier to build? It was also lighter.

I also seem to remember Dunstall mufflers that slipped onto the Honda pipes, after sawing off the Honda mufflers. I never saw these in real life, however, only pictures. They were almost as long as the 'twins', made a dramatic look to the bike, and had no baffles at all.

[Rookster]

Were there not two different styles of Dunstall headers?

For the K bikes there were actually 3 styles.  There may also have been a 4-1 that was produced in the late 70s.  Dunstall put it in one of their ads but there were no pictures and I have never seen the 4-1 for the CB750 by Dunstall.  They did however re-use the stock headers on their F converted bikes but with a Dunstall silencer.

F kitted bike:


The early Dunstall exhaust was the criss-crossed headers with the Decibel silencers or the dual silencers that Hondaman mentioned.  Those dual silencers were only made for a few seasons (1970-71).  Same for the alloy tank for the CB750:




The second version is the most popular with the tucked in headers and Decibel silencers:



The third was later and it also had the tucked in headers but they weren't as close to the frame rails.  The 1 & 4 headers actually ran outside the frame downtubes:


At one point Carpy had claimed he was making brand new Dunstall exhausts minus the silencers.  They were going to be the 2nd version.  He had them on his website for awhile but I'm not sure if he still does.  There are NOS Dunstall exhausts out there still.  Over time some of the chrome will have bubbled but otherwise are in great shape.  Its the Decibel silencers that you will have trouble getting.  They go for good money on ebay and there are probably no NOS ones left.  Those used Decibels do not age well.  Many of them will have been deformed by mounting them (they develop a curve along their length from being bolted into the Dunstall mounts) and they rust pretty good inside.

[HondaMan]

Excellent!
In the 3rd page shown above:
I see those 4-4 pipes I was thinking of: they appear to be 4-2-4 pipes, not slip-on for stock pipes, my bad. That's the very ad I had in my mind's eye! I also remember the "plumbing nightmare" version, not because of the fancy pipes, but because of the "computer at Belfast University" that designed it. At the time, I was a burgeoning Electronics Engineer, and we were using Burroughs and IBM systems that contained that sort of information as simple libraries: I thought "how quaint" when I saw their [bragging] ad. 

Today, that's a hand calculator equation...