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1979 Honda CB400TII Hawk II Tank Caps & Petcocks

Identify the tank and the source of a fuel leak before choosing parts. The 1979 Hawk II options include a complete gasketed filler cap, a separate cap seal and a threaded petcock, with different checks for an original or replacement tank.

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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 CB400TII Hawk II · Tank Caps & Petcocks Buying guide

Check the filler opening and fuel-valve connection

A cap-seal repair may preserve a sound cap, while a damaged cap calls for the complete assembly. At the fuel outlet, verify the thread and available clearance before choosing the petcock.

Parts to consider

1978-81 Honda CB400 Fuel Petcock ~ Replaces 16951-385-703 Threaded fuel petcockM16 × 1.5 tank connection; replaces references 16951-385-703, -701 and -702.View part Honda CB750 / CB550 / CB400 Filler Cap ~ Replaces 17620-399-010 OEM-style tank capReplacement cap with rubber gasket already fitted, referencing 17620-399-010. No retaining chain is supplied.View part Honda CB Gas Cap Rubber Seal ~ Replaces 17631-329-003 Separate tank-cap sealReplacement rubber seal referencing 17631-329-003 for the original-style cap.View part

Related parts: Aftermarket front tank cushion

Choose the cap repair deliberately

The complete OEM-style cap replaces reference 17620-399-010 and has its rubber gasket already installed. The separate seal references 17631-329-003. Inspect the fitted cap and filler opening to decide whether the whole cap or only its seal belongs on the order.

Check valve fit and tank support

The featured petcock uses an M16 × 1.5 connection and references 16951-385-703, -701 and -702. Confirm outlet direction and clearance on a changed tank. The linked aftermarket front tank cushion is sold individually; compare the worn mounting rubber before adding replacement supports.

Ordering questions

Does the complete cap already have a gasket?

Yes. The replacement cap is supplied with its rubber gasket installed. A separate cap seal is therefore a repair choice for an existing cap, rather than an automatic addition to a new cap.

Is a retaining chain included with the cap?

No retaining chain is supplied with this cap. Check how your existing cap is retained and include that requirement in the repair plan before ordering.

What must match on an aftermarket tank?

Check the filler-cap arrangement and the petcock connection independently. The featured petcock requires M16 × 1.5, and its outlet orientation and surrounding clearance should be compared with the changed tank.

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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