Author Topic: '77 K carbs on a '76 K?  (Read 1079 times)

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Offline GammaFlat

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'77 K carbs on a '76 K?
« on: March 16, 2008, 06:47:19 PM »
Will a set of carbs from a '77 K fit/work on a '76 K?  (750s)

The '77 carbs have one "fuel line in" as opposed to 4 on the '76 which is fine but I'm wondering about how it connects to the air box and the throttle linkage. 

Are there differences that will need modifications? 

Doh! forgot about the choke linkage.  The '76 choke lever is hanging off the left side of the carbs and the '77 has a "pull choke" on the console. 

Anybody done this adaptation before? 
« Last Edit: March 16, 2008, 06:49:33 PM by GammaFlat »
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Offline cafe750

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Re: '77 K carbs on a '76 K?
« Reply #1 on: March 16, 2008, 06:52:10 PM »
The throttle cables on on the 77 550's are longer, so those need to be changed, and you need to hook up the choke cable. The fuel line also needs to be rerouted. I think that was all that was to it, airbox and intake rubbers all fit the same way. Hope this helps!
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fuzzybutt

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Re: '77 K carbs on a '76 K?
« Reply #2 on: March 16, 2008, 08:12:47 PM »
new rubber manifolds too. they changed in 77

Offline 754

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Re: '77 K carbs on a '76 K?
« Reply #3 on: March 17, 2008, 08:28:42 AM »
I have run them on earlier motors.. make a bracket for the choke.

Stock cable may work, I did not vhange the rubbers, cant remember if I ran the airbox, probably not as I dont like them..

Maker of the WELDLESS 750 Frame Kit
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Offline eurban

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Re: '77 K carbs on a '76 K?
« Reply #4 on: March 17, 2008, 10:41:28 AM »
If you want the 77/78 carbs to fit properly without air leaks use the rubbers from the 77/78Ks. 

Offline 754

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Re: '77 K carbs on a '76 K?
« Reply #5 on: March 17, 2008, 06:32:37 PM »
They can & will work.

Will try to measure up both sets tommorow..
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline eurban

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Re: '77 K carbs on a '76 K?
« Reply #6 on: March 17, 2008, 06:38:13 PM »
Please do.  I think that you will find that Honda specced a different part for a reason . . . .

Offline 754

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Re: '77 K carbs on a '76 K?
« Reply #7 on: March 18, 2008, 07:20:07 PM »
I checked both sets of carbs today, the 77's still had the rubbers on & yes they are shorter.They do go on early motors with the 77/78 rubbers on the carbs.

The late carbs seem to be about 1/2 longer including rubbers.To use a factory airbox (with late carbs)the early likely wont work

The 76 & down require about an extra inch clearance above them to operate the throttles.

The early have a 40mm intake end, late has 46mm.
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline GammaFlat

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Re: '77 K carbs on a '76 K?
« Reply #8 on: March 18, 2008, 07:43:17 PM »
I can't believe how much time and trouble I save by being on this forum.  Exactly what I needed. 

Thanks a bunch guys!

John
K6
K7 
Suzuki GN400 - Ignition fixed!
03 KLR650 - Doesn't do anything very well but.. well.. does everything.