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1981 Honda CB650 Carb Floats & Components

Small carburetor parts deserve their own measurements on your 1981 Honda CB650. A float with pin, twelve connector O-rings and a pump diaphragm solve different service needs. Confirm the old diaphragm has the specified 89 mm end-to-end pin before choosing it.

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Currently viewing Carb Floats & Other Carb Components

Honda motorcycle parts

Choose your model and year to see parts listed for your bike.

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 CB650 · Carb Floats & Components Buying guide

Identify the carburetor component being renewed

The float includes its pivot pin. Connector O-rings and drain-screw seals are separate packages, while the pump diaphragm has a specific pin-length condition that matters more than a broad model label.

Parts to consider

Honda CB Carb Float ~ Replaces 16013-413-851 Carburetor float with pinReplacement float with pivot pin; four floats are used per motorcycle.View part Honda CB Carb Fuel Connector Tube and Accelerator Tube O-Rings Connector-tube O-ringsTwelve O-rings for carburetor fuel-connector and accelerator tubes.View part Honda CB750 / CB650 / CB450 Carb Pump Diaphragm ~ Replaces 16021-393-004 89 mm pump diaphragmDiaphragm with rod and one bellow rubber; requires an 89 mm end-to-end pin application.View part

Related parts: Drain screw with O-ring

Count supplied parts separately

A replacement float includes its pin, and the motorcycle uses four floats. The connector-tube package contains twelve O-rings. Build the quantity from the repair itself rather than assuming the same package size for every item used across the carb bank.

Keep pump and drain work distinct

The selected pump diaphragm must match an 89 mm end-to-end pin. Check that measurement on the removed part. For drain service, the linked replacement screw includes its O-ring and is sold individually; it is separate from the screws fastening the bowl.

Ordering questions

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.

How do I confirm the pump diaphragm application?

Measure the old diaphragm pin from end to end. This option is conditional on an 89 mm pin for the CB650; a matching year alone is insufficient.

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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