Carburetor swap?

If it's broken or just needs tweaked

Moderators: Volker_P, tidd650

CuzYNot
Posts: 4
Joined: Sun Jun 10, 2018 2:47 pm

Carburetor swap?

Postby CuzYNot » Mon Jun 11, 2018 2:51 pm

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?

Sent from my SAMSUNG-SM-G930A using Tapatalk

User avatar
Folsoml
Posts: 1600
Joined: Sat Apr 07, 2012 9:02 pm
Location: North Florida

Re: Carburetor swap?

Postby Folsoml » Wed Jun 13, 2018 2:49 pm

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.
Have a problem with your CB650? Have a technical question? Click here!


My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,

CuzYNot
Posts: 4
Joined: Sun Jun 10, 2018 2:47 pm

Re: RE: Re: Carburetor swap?

Postby CuzYNot » Wed Jun 13, 2018 3:46 pm

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?

Sent from my SAMSUNG-SM-G930A using Tapatalk

User avatar
Folsoml
Posts: 1600
Joined: Sat Apr 07, 2012 9:02 pm
Location: North Florida

Re: Carburetor swap?

Postby Folsoml » Wed Jun 13, 2018 5:48 pm

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.
Have a problem with your CB650? Have a technical question? Click here!


My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,

CuzYNot
Posts: 4
Joined: Sun Jun 10, 2018 2:47 pm

Re: RE: Re: Carburetor swap?

Postby CuzYNot » Wed Jun 13, 2018 5:51 pm

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?

Sent from my SAMSUNG-SM-G930A using Tapatalk

User avatar
Folsoml
Posts: 1600
Joined: Sat Apr 07, 2012 9:02 pm
Location: North Florida

Re: Carburetor swap?

Postby Folsoml » Wed Jun 13, 2018 7:53 pm

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.
Have a problem with your CB650? Have a technical question? Click here!


My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,

CuzYNot
Posts: 4
Joined: Sun Jun 10, 2018 2:47 pm

Re: RE: Re: Carburetor swap?

Postby CuzYNot » Wed Jun 13, 2018 8:14 pm

What about a bigger cc engine from the same year? Like a cb750 or 900?


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

Sent from my SAMSUNG-SM-G930A using Tapatalk

User avatar
Folsoml
Posts: 1600
Joined: Sat Apr 07, 2012 9:02 pm
Location: North Florida

Re: Carburetor swap?

Postby Folsoml » Thu Jun 14, 2018 6:59 am

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).
Have a problem with your CB650? Have a technical question? Click here!


My Current Bikes: 2005 HD FLHTCUI Electra Glide Ultra Classic, 2007 Yamaha Vino,


Return to “Technical Discussion”

Who is online

Users browsing this forum: No registered users and 6 guests