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1978 Honda CB750A Carb Floats, Pump & Hardware

Floats, an accelerator-pump diaphragm, drain screws, shaft felts and hardware cover different repair locations on the CB750A carburetors. Match the removed component before comparing piece counts. A float with pin, a pump kit and a bolt assortment each have a defined scope.

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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 CB550 air screw needle o-ring

Honda CB Air Screw Needle O-Ring

$1.95 USD
48-5043
Replace your air screw needle O-ring with this Air Screw Needle O-Ring, 2.8mm x 1.2mm.Note: sold each, order the quantity you require.Key Features• Air...
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 CB750A CB750F CB750K carb bolt kit

1976-78 Honda CB750A / CB750F / CB750K Carb Bolt Kit

$26.95 USD
73-1043
Restore your carburetor hardware with this Carburetor Bolt and Washer 46-Piece Kit, a complete bolt kit for all 4 carburetors.Key Features• Carburetor bolt and...
Honda CB750 CB550 CB400 CB350 Keihin pd carburetor felt throttle shaft seal set 6

Honda CB750 / CB550 / CB400 / CB350 Keihin PD Carburetor Felt Throttle Shaft Seal Set/6

$21.95 USD
33-0045
Replace worn or missing felt throttle shaft seals during carburetor service on compatible vintage Honda CB models with Keihin PD carburetors. These felt seals...
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1978 Honda CB750A · Floats, pump & carb hardware Buying guide

Locate the repair before comparing carburetor component packages

The float supplies its pin, the pump kit includes a diaphragm with rod and bellows, and the hardware kit lists forty-six pieces for four carburetors. Separate drain and felt-seal products serve other identified locations.

Parts to consider

Honda CB750 / CB650 / CB550 / CB125 Carb Float ~ Replaces 16013-405-004 Replacement float with pinFloat supplied with a pin, with references including 16013-405-004. The listing specifies four per motorcycle and instructs buyers to order the quantity needed; order one for each position being renewed.View part Honda CB750 / CB650 / CB450 Carb Pump Diaphragm ~ Replaces 16021-393-004 Pump diaphragm with bellowsKit with one diaphragm and rod plus one bellows rubber, referencing 16021-393-004 among its listed replacements.View part 1976-78 Honda CB750A / CB750F / CB750K Carb Bolt Kit Forty-six-piece carb hardware kitBolt and washer kit described for all four carburetors. The listing does not give a location-by-location fastener inventory.View part

Related parts: Individual drain screw with O-ring · Six Keihin PD throttle-shaft felt seals

Plan targeted repairs before adding a bank-wide hardware kit

Identify the component removed and assess the surrounding parts before choosing replacements. Add the four-carb fastener assortment only when that broader hardware refresh is part of the planned work.

Keep sealing locations identified during inspection

Separate bowl-drain parts from the throttle-shaft seals and compare each removed component with its own application. Check that the fitted carburetor type matches the felt-seal listing before adding those seals to the order.

Common questions

Is the pump listing’s 89mm note a CB750A requirement?

That conditional pin-length note is specifically written for the listed CB650 applications. The CB750A application is listed separately. Do not transfer another model’s condition into a Hondamatic specification; compare the removed diaphragm with its references and ask for confirmation if necessary.

Does the float purchase include a float needle?

The float description names the float and pin. A float needle is separately listed and is also named in the Hondamatic rebuild-kit contents. Check the selected packages before adding a needle already supplied by a kit.

Does the felt-seal set contain a complete carburetor gasket kit?

It is described as six felt throttle-shaft seals for compatible Keihin PD carburetors. That identified component and carburetor requirement differ from a rebuild package or bowl gasket. Confirm the installed carburetor type and the seal location rather than relying on the set count.

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