VintageCB750 Supplying CB Riders Since 2010

About Us Why Us? Reviews Shipping Info Returns Contact Us
Wish Lists
0 My Cart

Your cart is currently empty.

Browse all parts
Total (USD): $0.00
View cart
Menu
Search
Wish
Cart 0
My motorcycle Choose your Honda CB model

Search parts

Searching all Honda CB parts

Example: brake pads or oil filter.

1978 Honda CB400TII Hawk II Carburetor Small Parts

Small carburetor parts should be chosen by the fault and their exact location. A damaged drain screw or hardened O-ring calls for a different repair from a deteriorated air cut-off diaphragm. Inspect the fitted carburetor before ordering either service item for your Hawk II.

Close ×
Your saved bike Choose your Honda CB model

Shop By Category

Most orders ship same or next business day Fitment guarantee Listed for your exact model and year? We’ll make it right if it doesn’t fit as described. Mechanic-backed support Ask our team for help choosing the right Honda CB part.
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 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 CB400 carb float 16013-679-005

1978-79 Honda CB750 / CB400 Carb Float ~ Replaces 16013-679-005

$29.95 USD
20-6506
Replace your 1979 DOHC CB750 or CB400 carb float with this Carb Float with Pin, replacing OEM #16013-679-005.4 carb floats are used per bike,...
Honda CB400 air cut off valve 16048-425-671

1978-79 Honda CB400 Air Cut Off Valve ~ Replaces 16048-425-671

$27.03 USD
20-4022
Replace your CB400's carb air cut-off valve with this Carb Air Cut-Off Valve, replacing OEM #16048-425-671 (diaphragm) plus spring and O-ring.Key Features• Carb air...
compare

1978 Honda CB400TII Hawk II · Carburetor Small Parts Buying guide

Match the small part to its carburetor location

The drain screw includes an O-ring and is sold individually. The air cut-off choice combines a diaphragm, spring and O-ring for its separate location on the carburetor.

Parts to consider

Honda CB Stock Type Float Bowl Drain Screw Bowl drain screw with O-ringIndividual stock-type float-bowl drain screw supplied with an O-ring for the listed Hawk II carburetors.View part 1978-79 Honda CB400 Air Cut Off Valve ~ Replaces 16048-425-671 Air cut-off valve componentsCarburetor air cut-off diaphragm with spring and O-ring, corresponding to diaphragm reference 16048-425-671.View part

Check the drain-screw seat

Inspect the bowl and screw seat when dealing with a drain leak. A damaged screw or O-ring can be replaced, but damage to the bowl itself needs separate attention. Avoid using extra tightening as a substitute for identifying the source of leakage.

Identify diaphragm service correctly

Keep the air cut-off diaphragm, spring and O-ring together when reviewing the repair. Compare the original arrangement and use the Honda manual for disassembly and checks. Do not treat this purchase as a cure for every deceleration or idle complaint without diagnosis.

Common questions

Does the drain screw come with an O-ring?

Yes. The featured stock-type drain screw includes its O-ring and is sold individually. Count the drain positions you are servicing before ordering, rather than assuming a two-carburetor pack.

What comes with the air cut-off valve?

The offered service parts are the diaphragm, spring and O-ring. Compare them with the fitted carburetor’s air cut-off assembly and inspect the surrounding parts before deciding what the repair requires.

Will a new screw fix every float-bowl drain leak?

No. Inspect the screw, O-ring and the bowl’s sealing area to find the cause. If the seat or bowl is damaged, replacing only the screw may leave the underlying fault unresolved.

Not sure which part you need?

Send your model and year, plus photos of your existing part and any changes to the original setup.

Ask a fitment question
Parts categories for 1978 Honda CB400TII

Your cart

×