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1979 Honda CB650 Carb Floats & Pump Parts

Identify whether the repair concerns fuel level, a bowl drain or the accelerator pump before ordering 1979 CB650 carburetor parts. The float includes its pin, the drain screw includes an O-ring, and the pump diaphragm has an important 89mm pin-length condition.

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Currently viewing Carb Floats & Other Carb Components

Honda motorcycle parts

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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 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 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 CB750 CB650 CB550 CB125 carb float 16013-405-004

Honda CB750 / CB650 / CB550 / CB125 Carb Float ~ Replaces 16013-405-004

$27.95 USD
20-6509
Replace your late-'70s CB carb float with this Carb Float with Pin, replacing OEM #16013-405-004 / #16013-393-004 / #16013-KCY-670 / #16013-MN1-671.4 carb floats are...
Honda CB750F CB750K CB750L CB650 air cut off valve 16048-425-671

1979 Honda CB750 / CB650 Air Cut Off Valve ~ Replaces 16048-425-671

$24.95 USD
20-4021
Replace your 1979 DOHC CB's carb air cut-off valve with this Carb Air Cutoff Valve, replacing OEM #16048-425-671 (diaphragm) and #16048-425-305 (spring + 1...
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1979 Honda CB650 · Carb Floats & Pump Parts Buying guide

Match the component to the carburetor fault

Floats, drain seals and accelerator-pump diaphragms occupy different positions. Check the old pieces before ordering, with particular care over the pump rod length and the quantities supplied.

Parts to consider

Honda CB750 / CB650 / CB550 / CB125 Carb Float ~ Replaces 16013-405-004 Carburetor float with pinFloat supplied with its pin; four floats are specified per motorcycle.View part Honda CB750 / CB650 / CB450 Carb Pump Diaphragm ~ Replaces 16021-393-004 Accelerator-pump diaphragmDiaphragm with rod and bellows rubber. CB650 fit requires an 89mm end-to-end pin.View part Honda CB Stock Type Float Bowl Drain Screw ~-A Drain screw with O-ringSold individually, with its sealing O-ring included.View part

Related parts: Drain-screw O-ring four-pack

Measure before choosing the pump part

CB650 application of the featured diaphragm is conditional on an 89mm end-to-end pin. The package contains the diaphragm with rod and a bellows rubber. Measure the removed assembly before ordering rather than treating the broad model list as enough.

Separate drain repair from float replacement

The float is supplied with its pin, with four floats specified per motorcycle. The drain screw is sold individually with an O-ring. A separate four-pack of drain O-rings suits repairs where the screw itself can be retained after inspection.

Buying questions

Will the pump diaphragm fit every CB650 carburetor?

CB650 use of this diaphragm requires an 89mm end-to-end pin. Measure the old diaphragm and compare the installed carburetor arrangement before selecting the replacement.

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.

What if the bowl drain still leaks after replacing its screw or O-ring?

Inspect the screw tip, O-ring groove, bowl seat and surrounding bowl for damage or debris. A new seal cannot repair a damaged mating surface. Avoid using extra tightening force to mask the leak; it can damage the screw or bowl.

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