How to Remove a CV Carburetorby Don Davis
The CV, for constant velocity, carburetor was standard equipment on Harley-Davidson motorcycles until 2007, when Harley began delivering all bikes with electronic fuel injection. It has also been standard on Kawasakis and BMWs. It is often called a Keihin carb because it was originally manufactured by that Japanese carburetor maker, although it is a British invention. The CV has a vacuum-operated slide that changes the size of the venturi, the big air hole, in the carburetor to make a constant air velocity. In general, it comes off all bikes as it comes off a carbureted Harley.
Start the motorcycle with the petcock closed and run the motorcycle until the carburetor runs out of fuel. Unclip the choke knob from its attachment just in front of the rider's left thigh under the fuel tank.
Loosen one or more air cleaner cover bolts on the middle-right side of the motorcycle with a Torx or Allen socket, depending on your motorcycle, and a socket wrench. Disconnect the breather tubes that plug into the top of the air cleaner by hand.
Unbolt and remove the air cleaner with a Torx or Allen socket, depending on your motorcycle, and a socket wrench. Remove the air cleaner.
Loosen the hose clamp that attaches the fuel line to the carburetor with a flat-head screwdriver. Pull the fuel line from the carburetor by hand.
Mark the throttle and idle cables for later assembly with masking tape and a pen and unscrew the cables from the throttle cam.
Unbolt and remove the air cleaner backing plate with a Torx or Allen socket, depending on your motorcycle, and a socket wrench. Remove the air cleaner backing plate by hand.
Grab the CV carburetor with both hands and gently pull it from the rubber boot that attaches the carburetor to the intake manifold. Remove the carburetor and the choke assembly from the right side of the motorcycle as a unit.
Items you will need
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