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Author Topic: Will other CB750 exhausts work on cb750a?  (Read 3271 times)

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Offline redrider1940

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Will other CB750 exhausts work on cb750a?
« on: July 17, 2019, 09:32:05 AM »
Hello,

I'm new here and I bet this has been asked before but I couldn't find anything with a search. On my '77 the left side exhaust is rusted out and the previous owner did a hack job getting it back together. So I am either looking for a decent OEM replacement or I was wondering if exhausts from other 750s would work on my machine?
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Offline Don R

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Re: Will other CB750 exhausts work on cb750a?
« Reply #1 on: July 19, 2019, 05:24:32 AM »
A couple of the guys in the performance section are racing A's. They could answer. I plan to try couple but haven't yet. My older projects demand attention right now.
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Offline raymond10078

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Re: Will other CB750 exhausts work on cb750a?
« Reply #2 on: July 19, 2019, 01:33:36 PM »
On this forum, a number of people have chimed in on this topic.  I'm not able to do a forum search right now.

Also available are CB750A specific aftermarket pipes.

Generally, the deeper sump on the CB750A is a problem - not enough clearance for most pipes, as they "hug" the bottom of the engine quite closely, normally.
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1978 CB750A (upgrading very, very slowly)

Past bikes - Honda: SL350, CX650C, CB900C, CB1000C, CM450A; Kawasaki: several 1972 750 H2's; Suzuki: TC90J.

Bikes I want: CX650ED, a mid-sized japanese V-twin with ABS.

Offline raymond10078

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Re: Will other CB750 exhausts work on cb750a?
« Reply #3 on: July 22, 2019, 07:41:21 AM »
Completed search this morning.

Old thread - not much help.

http://forums.sohc4.net/index.php/topic,27553.msg1781806.html#msg1781806
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1978 CB750A (upgrading very, very slowly)

Past bikes - Honda: SL350, CX650C, CB900C, CB1000C, CM450A; Kawasaki: several 1972 750 H2's; Suzuki: TC90J.

Bikes I want: CX650ED, a mid-sized japanese V-twin with ABS.

Offline redrider1940

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Re: Will other CB750 exhausts work on cb750a?
« Reply #4 on: July 23, 2019, 05:35:30 AM »
Thanks. I bet he doesn't still have that exhaust still available :)
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Offline grcamna2

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Re: Will other CB750 exhausts work on cb750a?
« Reply #5 on: July 24, 2019, 10:13:06 AM »
Quote from: redrider1940 on July 23, 2019, 05:35:30 AM
Thanks. I bet he doesn't still have that exhaust still available :)

Redrider,
I'm Bill,the reddit member who recommended this forum to you.We will figure out a way to get you some better oem type exhaust.  ;)
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Offline redrider1940

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Re: Will other CB750 exhausts work on cb750a?
« Reply #6 on: July 27, 2019, 05:26:04 PM »
Cool thanks
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Offline carnivorous chicken

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Re: Will other CB750 exhausts work on cb750a?
« Reply #7 on: July 28, 2019, 09:19:23 AM »
Quote from: redrider1940 on July 23, 2019, 05:35:30 AM
Thanks. I bet he doesn't still have that exhaust still available :)

If that's at me -- nope, they went pretty quickly...
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Offline sammon287

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Re: Will other CB750 exhausts work on cb750a?
« Reply #8 on: September 04, 2019, 11:20:47 AM »
Quote from: grcamna2 on July 24, 2019, 10:13:06 AM
Quote from: redrider1940 on July 23, 2019, 05:35:30 AM
Thanks. I bet he doesn't still have that exhaust still available :)

Redrider,
I'm Bill,the reddit member who recommended this forum to you.We will figure out a way to get you some better oem type exhaust.  ;)

Please share if you find something that works. My 76A has a one year only exhaust (4 into 1). The header is cosmetically bad and getting it re-chromed doesn't seem to be an option. I'll switch to the later 4 into 2 if I have to.
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1976 CB750A

Offline vik351

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Re: Will other CB750 exhausts work on cb750a?
« Reply #9 on: September 18, 2019, 07:09:36 AM »
do folk run without  baffles in these like i did with my K2 back in the 70’s ...,?

or they too loud ? 2 into one set up ?

havent got my bikes yet, next week prolly...

vik...

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Offline dave the welder

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Re: Will other CB750 exhausts work on cb750a?
« Reply #10 on: September 20, 2019, 10:58:46 AM »
don't remove baffles carb is already on lean side. pulling baffles will really lean it out and run like #$%*
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Offline vik351

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Re: Will other CB750 exhausts work on cb750a?
« Reply #11 on: September 21, 2019, 04:21:50 AM »
Quote from: dave the welder on September 20, 2019, 10:58:46 AM
don't remove baffles carb is already on lean side. pulling baffles will really lean it out and run like #$%*

OK , will well leave alone, I notice alot of the exhaust pipes are nearly blue and seem to be gettin a bit on the hot side.

So from the bits I have read on here the 28 mm round tops are a good start, quench the thirst a bit and same for the asthma...???

vik...
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Offline dave the welder

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Re: Will other CB750 exhausts work on cb750a?
« Reply #12 on: September 21, 2019, 06:06:18 AM »
you will love adding the round tops
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Offline vik351

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Re: Will other CB750 exhausts work on cb750a?
« Reply #13 on: September 21, 2019, 06:36:34 AM »
Quote from: dave the welder on September 21, 2019, 06:06:18 AM
you will love adding the round tops

Would you happen to know what I should get then, as in what part numbers etc thanks ...???

Looking on evil bay and there is bugger all for a set of K something all in one piece...

I really should get to ride my bike first I spose, might have lost the plot and sihtmeself on it anyway  :-[

But some how I dont think so... ;D

vik...
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Offline dave the welder

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Re: Will other CB750 exhausts work on cb750a?
« Reply #14 on: September 21, 2019, 05:46:43 PM »
read thru all the performance mods listed here. they will walk you thru everything you need to swap carbs
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Offline sammon287

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Re: Will other CB750 exhausts work on cb750a?
« Reply #15 on: December 18, 2019, 04:31:59 AM »
All I can find new are MAC 4-into-2 for 77-78 model years. Nothing for a '76A. I wonder how much modification it would take to fit a 4into1 from another model. A little hammer massage, or cutting and welding?
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1976 CB750A

Offline tscott

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Re: Will other CB750 exhausts work on cb750a?
« Reply #16 on: December 22, 2019, 08:14:59 PM »
Yeah, I've got holes on the inside of both of my mufflers but the headers all look good. I'm assuming just taking a hacksaw to where the weld is holding the muffler to the headers (4-2 oem system) and then adding new mufflers with a clamp would not be a big deal... anyone on this thread done anything like that?
Thanks!
Toran
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