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1972 Honda CB100K2 Tank Caps & Petcocks

Tank-side fuel repairs on a 1972 Honda CB100K2 need a clear distinction between an original petcock seal and a replacement tap. A separate filler-cap seal and a cap with an installed gasket provide different choices at the tank opening.

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Currently viewing Gas Tanks, Caps, Petcocks & Parts

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Honda CB750 CB550 CB500 CB350 CB200 fuel petcock gasket 16997-273-006

Honda CB Fuel Petcock Body O-Ring / Gasket ~ Replaces 16997-273-006

$5.50 USD
49-0260
Replace your fuel petcock gasket with this Fuel Petcock Gasket / O-Ring, replacing OEM #16997-273-006 / #16960-011-000. This is the O-ring that goes between...
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...
New
Honda CB450 CL450 CB350 CB72 gas tank filler cap 17620-402-000

Honda Gas Tank Filler Cap ~ Replaces 17620-402-000

$7.95 USD
07-4647
Restore an early-era Honda with this Chrome Gas Tank Filler Cap (with gasket installed), replacing OEM #17620-402-000 / #17620-402-010. Fits the oldest models in...
New
Honda CB125S CB100K fuel petcock 16950-107-000

1970-74 Honda CB125S / CB100K Fuel Petcock ~ Replaces 16950-107-000

$21.46 USD
29-0541
Replace your CB100K or CB125S fuel petcock with this Fuel Petcock, replacing OEM #16950-107-000 / #16950-107-005 / #16950-356-005 / #16950-356-700. Single fuel output type...
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1972 Honda CB100K2 · Tank Caps & Petcocks Buying guide

Distinguish original-tap sealing from tap replacement

The stock-petcock body seal and filler-cap choices address separate tank fittings. The related replacement tap has a longer body and side-exit outlet; compare its installation before combining it with a seal intended for an original tap.

Parts to consider

Honda CB Fuel Petcock Body O-Ring / Gasket ~ Replaces 16997-273-006 Original-Petcock Body SealO-ring for the joint between the stock OEM petcock body and tank. Not specified for aftermarket replacement petcocks.View part Honda Gas Tank Filler Cap ~ Replaces 17620-402-000 Chrome Filler Cap with GasketChrome cap supplied with its gasket installed; replaces 17620-402-000 and 17620-402-010.View part Honda CB Gas Cap Rubber Seal ~ Replaces 17631-329-003 Separate Filler-Cap SealReplacement rubber seal, reference 17631-329-003, for the CB100K 1970–72 application.View part

Related parts: Single-Outlet Replacement Petcock

Allow for the replacement tap’s different layout

The linked replacement petcock has one fuel output and a side-exit hose connection. Its body is longer, and its outlet position can differ from stock on some models. Compare the available space and hose path before ordering, especially with a replacement tank.

A cap replacement already has a gasket installed

The featured chrome filler cap is supplied with its gasket installed. The separate featured cap seal uses reference 17631-329-003 for a retained compatible cap. Inspect the existing cap and tank opening before deciding whether the job needs a complete cap or only replacement rubber.

Ordering questions

Will the original-petcock gasket fit the linked replacement tap?

Do not assume so. The featured O-ring is specified for stock OEM petcocks. The linked replacement tap has a different body layout, so verify its own sealing requirements before combining the two products.

What should I check if my tank has been changed?

Identify its tap connection and compare the replacement tap’s longer body and side-exit outlet with the space and hose route available. A motorcycle-year application does not verify a substituted tank fitting.

Should I add a separate cap gasket when buying the chrome cap?

The featured chrome filler cap already has a gasket installed. Choose the separate seal when servicing a compatible cap you intend to retain, after inspecting its condition and the tank opening. Adding both is not automatically necessary.

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