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1978 Honda CB400TI Hawk I Tank Caps & Petcocks

A changed fuel tank can alter both the filler-cap and petcock choices on a Hawk I. For an original-style arrangement, compare the complete cap, its separate rubber seal and the threaded fuel valve with the components actually fitted before deciding what to renew.

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Currently viewing Gas Tanks, Caps, Petcocks & Parts

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Honda CB750 CB550 CB450 CB400 CB350 gas cap rubber seal 17631-329-003

Honda CB Gas Cap Rubber Seal ~ Replaces 17631-329-003

$7.95 USD
20-0097
Replace the broad-fitment gas cap rubber seal on many classic Hondas with this Gas Cap Rubber Seal, replacing OEM #17631-329-003. Exceptionally wide fitment covering...
Honda CB750 CB550 CB400 filler cap 17620-399-010

Honda CB750 / CB550 / CB400 Filler Cap ~ Replaces 17620-399-010

$69.95 USD
73-0079
Replace your gas tank cap with this OEM Style Gas / Fuel Tank Cap with rubber gasket already installed, replacing OEM #17620-399-010.Note: does not...
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Honda CB400 fuel petcock 16951-385-703

1978-81 Honda CB400 Fuel Petcock ~ Replaces 16951-385-703

$15.82 USD
29-0543
Keep fuel flowing reliably to your carburetors with this Fuel Petcock, designed as a direct replacement for several original Honda fuel valve assemblies. This...
Honda CB front fuel tank rubber cushion 17611-KE8-000

Front Fuel Tank Rubber Cushion ~ Replaces Honda OEM 17611-KE8-000

$5.50 USD
27-5520
This aftermarket front fuel tank rubber cushion replaces Honda OEM 17611-KE8-000 on the listed Honda CB-series applications. It mounts to the frame and supports...
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1978 Honda CB400TI Hawk I · Tank Caps & Petcocks Buying guide

Match the tank fittings before ordering

The fuel valve uses an M16 × 1.5 connection. The complete cap includes its rubber gasket, while the separate cap seal is a focused option when the existing cap remains serviceable.

Parts to consider

1978-81 Honda CB400 Fuel Petcock ~ Replaces 16951-385-703 M16 × 1.5 fuel petcockFuel valve with a 16 × 1.5 tank connection, replacing Honda references 16951-385-703, 16951-385-701 and 16951-385-702.View part Honda CB750 / CB550 / CB400 Filler Cap ~ Replaces 17620-399-010 Replacement tank filler capOEM-style cap replacing reference 17620-399-010. Rubber gasket is installed; a retaining chain is not included.View part Honda CB Gas Cap Rubber Seal ~ Replaces 17631-329-003 Separate fuel-cap rubber sealReplacement rubber seal for a compatible existing fuel cap, referencing Honda 17631-329-003.View part

Verify the actual fuel-tank connection

The petcock references 16951-385-703, 16951-385-701 and 16951-385-702, with a 16 × 1.5 thread. Check the tank fitting, outlet location and available clearance before ordering. The original model application cannot establish compatibility with an aftermarket or swapped tank.

Choose a whole cap only when needed

The OEM-style replacement cap comes with its rubber gasket installed and does not include a retaining chain. The separate 17631-329-003 replacement seal may suit a reusable compatible cap. Inspect the cap and filler neck so a sealing purchase does not overlook damaged hardware.

Common buying questions

Will the petcock fit an aftermarket tank?

Only after its connection and layout are checked. Compare the specified M16 × 1.5 thread, fuel outlet and clearance with that tank rather than assuming the original Hawk I application still applies.

Do I need a separate seal with the complete cap?

The replacement cap already has a rubber gasket installed. The separate seal is a repair option for a compatible existing cap, so it is not automatically required when buying the complete replacement.

Is the replacement cap a genuine Honda cap with a chain?

It is described as an OEM-style replacement, not a genuine Honda product. A rubber gasket is included, but a retaining chain is not supplied with the cap.

Not sure which part you need?

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

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