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Author Topic: Running CB500 carbs on a CB550  (Read 322 times)

Offline stillatwork

  • Posts: 88
Running CB500 carbs on a CB550
« on: Mar 17, 2017, 21:18:09 »
Can you do this? I have Keihin 627B carbs off the 71-73 CB500 I'd like to put on a 1976 cb550

Offline stillatwork

  • Posts: 88
Re: Running CB500 carbs on a CB550
« Reply #1 on: Mar 17, 2017, 21:36:15 »
My guess is yes with compensating for the extra fuel the displacement would require. Even more if not stock i.e. Pods and exhaust


Offline cxman

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Re: Running CB500 carbs on a CB550
« Reply #3 on: Mar 17, 2017, 21:54:20 »
i have a set of 550 carbs on my 500 so no reason why iot would not work the other way that i know of

but you will need to rejet
1978 CX650 Super Deluxe
1979 XS1100 Special
1980 XS650
1980 cx500  The Beast
1983 GL650 i
1983 cx650 Custom
1973 CB450
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1977  gl1000
1976 gl1000 LTD
 1983 GL1100 Nekid
and a bunch of others

Offline stillatwork

  • Posts: 88
Re: Running CB500 carbs on a CB550
« Reply #4 on: Mar 19, 2017, 12:50:14 »
What do you mean the holes would have to line up? So rejetting should be ok for use? Any suggestions where's to start with a 4 into 1 exhaust with an emgo cone muffler and uni pods

Offline irk miller

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Re: Running CB500 carbs on a CB550
« Reply #5 on: Mar 19, 2017, 12:52:21 »
SOunds like cxman is confirming that they line up.  The carbs are on a rack, so the carbs are spaced according to where the intakes line up.  The two motors would need to be the same to swap carbs.

Offline stillatwork

  • Posts: 88
Re: Running CB500 carbs on a CB550
« Reply #6 on: Mar 19, 2017, 15:11:21 »
Right so you can swap but will need rejet?

Offline stillatwork

  • Posts: 88
Re: Running CB500 carbs on a CB550
« Reply #7 on: Mar 19, 2017, 15:11:57 »
Would the increase in displacement 500 to 550 increase the netting even more? Any thoughts on float height?

Offline cxman

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Re: Running CB500 carbs on a CB550
« Reply #8 on: Mar 19, 2017, 16:15:12 »
you will need to rejet for sure
1978 CX650 Super Deluxe
1979 XS1100 Special
1980 XS650
1980 cx500  The Beast
1983 GL650 i
1983 cx650 Custom
1973 CB450
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1977  gl1000
1976 gl1000 LTD
 1983 GL1100 Nekid
and a bunch of others

Offline stillatwork

  • Posts: 88
Re: Running CB500 carbs on a CB550
« Reply #9 on: Mar 20, 2017, 23:43:55 »
Ordering 120 and 130 mains and 40 slows. Will set stock Cb500f float height. Was checking SOHC apparently these 500 and 550 carbs are pretty similar set up stock so hoping this isn't a big deal to do. Someone stop me if it is. Running uni pods and a canister 4 into 1 exhaust with an emgo cone muffler welded on. I'm open to any suggestions or anyone's two cents

Offline Bootsey

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Re: Running CB500 carbs on a CB550
« Reply #10 on: Mar 21, 2017, 06:01:58 »
I believe a 76' CB550K would have 022A carbs, which are essentially exactly the same as the 627B's, but with some slightly different settings which can be altered. The brass hardware can be switched between, and should fit up as normal.
The table below might be of some help.


Offline stillatwork

  • Posts: 88
Re: Running CB500 carbs on a CB550
« Reply #12 on: Mar 21, 2017, 12:50:03 »
I'm doing this for someone..so it's not really up to me. The carbs would have to be jetted regardless so I guess I would have to do it with 550 or 500 carbs. Just making sure that the swap is ok