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1981 Honda CB650C Custom Carb Floats & Pump Parts

Carburetor small parts on the 1981 CB650C include several different package types: a float with pin, twelve connector-tube O-rings and a conditional pump-diaphragm kit. Identify the exact service location before ordering, and measure the pump pin rather than selecting it from the model label alone.

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Currently viewing Carb Floats & Other Carb Components

Honda motorcycle parts

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Honda CB1100 CB1000 carb fuel connector tube and accelerator tube

Honda CB Carb Fuel Connector Tube and Accelerator Tube O-Rings

$15.26 USD
73-0831
Replace your carb fuel and accelerator tube O-rings with these Carburetor Fuel Connector Tube and Accelerator Tube O-Rings, 12 O-rings.Key Features• Carb fuel connector...
Honda CB750 CB650 CB450 carb pump diaphragm 16021-393-004

Honda CB750 / CB650 / CB450 Carb Pump Diaphragm ~ Replaces 16021-393-004

$27.95 USD
20-9040
Rebuild your Keihin carb's accelerator pump with this Carb Pump Diaphragm, replacing OEM #16021-393-004 / #16021-393-014 / #16021-MC9-771. Kit contains 1 diaphragm with rod...
Honda CB1100 CB1000 CB900 CB750 float bowl drain screw o-rings pk 4

Honda CB Float Bowl Drain Screw O-Rings Pk/4

$5.80 USD
48-0792
Replace your float bowl drain screw O-rings with this Float Bowl Drain Screw O-Rings 4-Pack.Key Features• Float bowl drain screw O-rings• 4 per packFitment...
Honda CB1100 CB1000 CB900 CB750 CB650 carb float 16013-413-851

Honda CB Carb Float ~ Replaces 16013-413-851

$27.95 USD
20-6507
Replace your 1980+ DOHC CB carb float with this Carb Float with Pin, replacing OEM #16013-413-851. Broad fitment across the 1980-82 CB750 family, CB750SC...
Honda CB1100 CB1000 CB900 CB750 float bowl drain screw -a

Honda CB Stock Type Float Bowl Drain Screw ~-A

$6.50 USD
48-5042
Small part, but an important one. This float bowl drain screw with included O-ring allows you to properly drain the carburetor bowl without leaks,...
Honda CB1100 CB1000 CB900 CB750 float bowl screws pk 2 93892-04016-00

Honda CB Float Bowl Screws Pk/2 ~ Replaces 93892-04016-00

$2.50 USD
48-9031
Replace your float bowl screws with this Float Bowl Screws Pack of 2 (with lock washers), 2 screws and 2 washers per pack. These...
Honda CB1100 CB1000 CB900 CB750 float bowl drain screw

Honda CB Stock Type Float Bowl Drain Screw

$6.50 USD
48-5042
Replace your stock-type float bowl drain screw with this Float Bowl Drain Screw with O-Ring for the later DOHC and Nighthawk lineup.Note: sold each,...
Honda CB1100 CB1000 CB900 carb felt throttle and choke shaft seal set 12

Honda CB Carburetor Felt Throttle & Choke Shaft Seal Set/12

$32.95 USD
33-0044
Replace worn or missing felt throttle and choke shaft seals during carburetor service on compatible vintage Honda CB models. These felt seals are used...
Honda CB1100 CB1000 CB900 CB750 CB650 carburetor cap screw set 8

Honda CB Carburetor Cap Screw Set/8

$5.80 USD
73-0100
Refresh your DOHC carb cap screws with this Carburetor Cap Screw Set of 8 with metal washers.Key Features• Carburetor cap screw set, 8 pieces•...
Honda CB1100 CB1000 Keihin pd carb felt throttle shaft seal set 6

Honda CB Keihin PD Carburetor Felt Throttle Shaft Seal Set/6

$18.95 USD
33-0043
Replace worn or missing felt throttle shaft seals on Keihin PD carburetors. These felt seals are used during carburetor service or restoration to help...
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1981 Honda CB650C Custom · Carb Floats & Pump Parts Buying guide

Count the package and confirm the pump dimension

The float references 16013-413-851 and four are used per motorcycle. The pump diaphragm requires an 89mm end-to-end pin for this application, while the twelve O-rings serve the fuel and accelerator connector tubes.

Parts to consider

Honda CB Carb Float ~ Replaces 16013-413-851 Carburetor float with pinFloat and pin for reference 16013-413-851. Four floats are specified per bike, ordered by the quantity needed.View part Honda CB750 / CB650 / CB450 Carb Pump Diaphragm ~ Replaces 16021-393-004 89mm pump diaphragm kitOne diaphragm with rod and one bellows rubber. CB650C application requires an 89mm end-to-end pin.View part Honda CB Carb Fuel Connector Tube and Accelerator Tube O-Rings Carb connector O-ring setTwelve O-rings for fuel connector and accelerator tubes on the listed 1981 Custom carburetors.View part

Use the float’s supplied-pin description carefully

The float product includes a pin and tells buyers that four floats are used per motorcycle. Order the number needed after inspecting the carburetors. That per-bike requirement does not turn a single product entry into a four-float kit.

Keep the pump and connector packages distinct

The pump kit supplies a diaphragm with rod and a bellows rubber, subject to the 89mm-pin requirement. The connector package supplies twelve O-rings. Compare their locations and contents before adding other drain-screw or bowl seals that belong to separate carburetor fittings.

Carb Floats & Pump Parts questions

How long must the old pump pin be?

The CB650C application requires 89mm end-to-end. Measure the old diaphragm’s pin before ordering this kit rather than assuming every accelerator pump shares the same rod length.

Can I use one float-height setting for every carburetor listed with this float?

Use the Honda specification for the exact carburetor fitted rather than borrowing a setting from another application. Check free movement of the float and valve, verify the specified float height or fuel level, and confirm fuel shuts off without leakage before use.

Can the connector-tube O-rings be replaced without separating the carburetors?

The carburetors must be separated enough to remove the fuel-connector and accelerator tubes. The twelve O-rings serve those tube joints; they are not a complete bowl, drain or shaft-seal kit. Use the correct rack service procedure for the work.

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