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1978 Honda CB750K Carb Floats, Pump & Hardware

This selection separates the float, accelerator-pump diaphragm, drain sealing pieces and carb hardware. Match the location needing repair on your 1978 CB750K before buying. Hardware packages cover different scopes, and a replacement float is distinct from the separately listed float needle.

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Currently viewing Carb Floats & Other Carb Components

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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 CB750F CB750K carb overflow guide 11355-300-000

1971-78 Honda CB750F / CB750K Carb Overflow Guide ~ Replaces 11355-300-000

$7.50 USD
73-0951
Replace your carb overflow guide with this Carb Overflow Guide, replacing OEM #11355-300-000.Key Features• Carb overflow guide• Replaces OEM #11355-300-000• Honda part name: Guide,...
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,...
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Honda CB750F CB750K carburetor screw kit

1977-78 Honda CB750F / CB750K Carburetor Screw Kit

$19.95 USD
49-0772
Refresh your 1977-78 CB750 carb screws with this Carburetor Screw Kit. Get a new set of screws to clean up the look of your...
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 CB750K · Floats, pump & carb hardware Buying guide

Identify the small component and avoid duplicate hardware

A float comes with its pin, the pump kit contains its own rubber pieces, and hardware kits serve separate jobs. Read those package contents before combining several products for one carburetor service.

Parts to consider

Honda CB750 / CB650 / CB550 / CB125 Carb Float ~ Replaces 16013-405-004 Replacement carb float with pinFloat with pin, replacing 16013-405-004, 16013-393-004, 16013-KCY-670 and 16013-MN1-671; the listing specifies four per bike, ordered as needed.View part Honda CB750 / CB650 / CB450 Carb Pump Diaphragm ~ Replaces 16021-393-004 Pump diaphragm and bellowsOne diaphragm with attached rod and one bellows rubber; references 16021-393-004, 16021-393-014 and 16021-MC9-771.View part 1977-78 Honda CB750F / CB750K Carburetor Screw Kit Carburetor screw kitIncludes four drain screws with O-rings plus listed screws and lock washers. Review the full quantities before buying extras.View part

Related parts: Individual drain screw with O-ring · Six felt seals for Keihin PD shafts · Forty-six-piece carb bolt and washer kit

Keep the shaft seals tied to the fitted carburetor type

The six-piece felt seal set is described for compatible Keihin PD carburetors. Identify an exchanged rack before ordering these shaft seals. Drain-screw O-rings serve a different location and should be matched to the existing drain hardware.

Check the two hardware-kit scopes

The 46-piece bolt-and-washer kit describes coverage for all four carburetors but does not itemize its hardware. Screw kit 49-0772 provides an itemized list. Compare that list with the damaged fasteners rather than treating the two kit totals as equivalent contents.

Common questions

Which screws are itemized in kit 49-0772?

It lists four drain screws with O-rings, one 4 × 8 screw, eleven 4 × 12 screws and twelve 4 × 16 screws, each with a lock washer. Compare the removed hardware and required locations before choosing it over the non-itemized 46-piece bolt kit.

Can I order drain O-rings without new screws?

Yes. A separate four-pack of drain-screw O-rings is present. The screw kit already lists four drain screws with O-rings. Choose between replacing seals or hardware by what is actually needed and avoid counting the same included seals twice.

Does the diaphragm’s 89 mm pin condition identify a CB750K measurement?

No. The condition is attached to CB650 fitment, whereas the 1977–78 CB750K is listed separately. Compare the pump assembly and replacement references on the actual carburetors; do not transfer the CB650 measurement to an exchanged or unidentified CB750K rack.

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