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1979 Honda CB400TI Hawk I Tank Caps & Petcocks

Tank hardware for the 1979 Honda CB400TI Hawk I needs to match the tank actually on the motorcycle. Compare the threaded petcock, replacement filler cap and separate cap seal, particularly if a previous owner changed the tank or its fittings.

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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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1979 Honda CB400TI Hawk I · Tank Caps & Petcocks Buying guide

Check the tank fitting before the model label

The petcock’s specified thread and the filler cap’s package contents answer different ordering questions. Confirm the tank connection first, then decide whether the cap needs a complete replacement or only its seal.

Parts to consider

1978-81 Honda CB400 Fuel Petcock ~ Replaces 16951-385-703 Threaded Fuel PetcockFuel valve with an M16 × 1.5 tank connection and verified Hawk I application.View part Honda CB750 / CB550 / CB400 Filler Cap ~ Replaces 17620-399-010 Fuel Cap with GasketOEM-style filler cap with its rubber gasket installed; no retaining chain is supplied.View part Honda CB Gas Cap Rubber Seal ~ Replaces 17631-329-003 Fuel-Cap Rubber SealSeparate cap seal replacing Honda reference 17631-329-003.View part

Match the fuel valve to the tank

The petcock uses an M16 × 1.5 tank connection and lists the 1979 Hawk I. A swapped tank still needs its own thread and clearance check. Compare the outlet arrangement against the fitted fuel routing instead of assuming every compatible-looking tank shares the original fitting.

Avoid an unnecessary cap-seal duplicate

The complete OEM-style filler cap already has a rubber gasket installed, but no chain is included. The separate rubber seal replaces reference 17631-329-003. Inspect the current cap to decide which purchase suits the repair before ordering both a complete cap and another seal.

Ordering questions

What should I check if the fuel tank was changed?

Check the actual tank connection for M16 × 1.5 thread, then compare the outlet position and clearance. The Hawk I application does not establish fit to every aftermarket or substituted tank.

Does the replacement cap include a gasket and chain?

Its rubber gasket is already installed. A retaining chain is explicitly not included, so account for that detail before choosing it for a restoration requiring the original arrangement.

Can I buy only the cap seal?

Yes. A separate rubber seal is available under reference 17631-329-003. Match it to the cap fitted; the separate seal is a different choice from buying the complete cap with its installed gasket.

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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