You can also thread a sheet metal screw into the drilled hole and use this to pull the plug out. This will create a stop to keep the bit from drilling too deep. Tip: To keep from drilling too far into the plug, it has been suggested to wind electrical tape around your drill bit quite a few times about 3/16? from the tip. Allow the drill to slowly cut into the plug rather than push.
You don’t want to damaged the mixture screw just below the plug. Drill a hole into the plug making sure not to “punch” through too fast. Secure the carb in either a vise or by other means that will allow the carburetor to remain steady. The metal plug is very soft and only requires a household drill and 7/64? to 1/8? bit. Gaining access to this screw is key to fine tuning and must be remove. The tower is plugged with a soft metal insert covering the mixture screw. The CV style Harley carburetor has a small cylindrical tower protruding from the bottom rear of the spigot (behind the bowl). Do not remove the bowl at this point to prevent debris from entering the carburetor. With the carb removed, place upside down on a sturdy work surface. If your model has multiple vacuum hoses it would be a good idea to label these as well. Remove the cables that you tagged and remove any vacuum hoses. Gently rock or twist the carb back and forth as you pull it away from the engine. A Harley carb is only held to the manifold with a slip fit rubber manifold boot. Now that you have enough slack in the cables you can pull the carburetor away from the manifold. A simple “Top” and “Bottom” should suffice when tagging each cable. This is a good time to label each cable to avoid any confusion when reconnecting them to the carb’s throttle cam. If you count how many turns each adjuster is loosened then you can return them to the exact adjustment when reinstalling your carb. A couple turns is usually all it takes to give you enough slack.
Next loosen both throttle cables from their adjusters located just beyond where they exit the throttle grip. Be sure to have a new hose clamp available. This may be cut or pried off to remove since you won’t be using it again. The hose is likely fastened using a special crimped clamp. Disconnect the fuel line from the fuel inlet on the carburetor or the opposite end connected to the fuel petcock, whichever is simpler to access. The choke cable can stay attached to the carburetor during this procedure, simply detach the knob end from the horm bracket. Having the mixture properly tuned is critical to making this carburetor perform and should always be performed prior to or at the same time you rejet the carb. Note: Before proceeding to rejet your carburetor it is recommended that you perform the following tuning procedure.
#Keihin cv carburetor manual install
Remove the choke cable from it’s mounting bracket on the opposite side of the bike.īe sure to install a new set of spark plugs when tuning. This is a good time to inspect these bolts for obstructions in their passages. Remove the aircleaner assembly including the backing plate which is attached to each head with a banjo bolt. Begin by shutting off the petcock fuel valve and starting the engine to allow all fuel within the carburetor bowl to be emptied. Preparing the carburetor for tuning will require removal from your Harley-Davidson’s engine but this is easily accomplished.
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