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Carburetor swap?

Posted: Mon Jun 11, 2018 2:51 pm
by CuzYNot
Hey i have a 81 650c and the carbs are shit. Looks like someone tried to clean it with a battle ax.

So i was wondering what carbs i should swap it with or what bikes have compatible carbs?

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Re: Carburetor swap?

Posted: Wed Jun 13, 2018 2:49 pm
by Folsoml
Your bike has VB44A Carbs. The 81 and 82 CB650 and CB650C are the only bikes that used these carbs. The only others that I know would be compatible are the VB43C carbs from the 1982 Nighthawk 650.

Re: RE: Re: Carburetor swap?

Posted: Wed Jun 13, 2018 3:46 pm
by CuzYNot
Folsoml wrote:Your bike has VB44A Carbs. The 81 and 82 CB650 and CB650C are the only bikes that used these carbs. The only others that I know would be compatible are the VB43C carbs from the 1982 Nighthawk 650.
Damn okay i was hoping there would be more options. What makes carbs compatible or not in the first place?

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Re: Carburetor swap?

Posted: Wed Jun 13, 2018 5:48 pm
by Folsoml
Mostly that it will need to line up with the cylinder head. There may be some that will work, but the only one I know of is the Nighthawk.

Re: RE: Re: Carburetor swap?

Posted: Wed Jun 13, 2018 5:51 pm
by CuzYNot
Folsoml wrote:Mostly that it will need to line up with the cylinder head. There may be some that will work, but the only one I know of is the Nighthawk.
Do you think a 83 nighthawk would fit?

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Re: Carburetor swap?

Posted: Wed Jun 13, 2018 7:53 pm
by Folsoml
Cant say for sure. In 1983 the 650 Nighthawk switched to a double overhead cam engine. The cylinder heads are different, so the spacing may also be different.

Re: RE: Re: Carburetor swap?

Posted: Wed Jun 13, 2018 8:14 pm
by CuzYNot
What about a bigger cc engine from the same year? Like a cb750 or 900?


(P.s. thanks btw youve been alot of help)

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Re: Carburetor swap?

Posted: Thu Jun 14, 2018 6:59 am
by Folsoml
The CB750 and CB900 carbs function different internally. The CB650 carb have one main jet, while the larger engine carbs have primary and secondary main jets. The larger bikes also used DOHC engines, so I doubt the intakes would line up correctly (Note that I've never tried to see how they'd fit).