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1971 Honda CB100K1 Tank Caps & Petcock Seals

Assess the filler cap and petcock as separate tank fittings on your 1971 CB100K1. A complete chrome cap already includes its gasket; the separate cap seal suits a seal-only order, while the petcock O-ring is restricted to stock OEM taps.

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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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1971 Honda CB100K1 · Tank Caps & Petcock Seals Buying guide

Choose the tank fitting before selecting its seal

The three choices serve the filler cap or the tank-to-petcock joint. Keep the complete-cap purchase distinct from replacement rubber, and identify any changed tap before using the stock-petcock gasket.

Parts to consider

Honda CB Fuel Petcock Body O-Ring / Gasket ~ Replaces 16997-273-006 Tank-to-Petcock O-RingSeal between the tank and stock OEM petcock body; replaces references 16997-273-006 and 16960-011-000.View part Honda Gas Tank Filler Cap ~ Replaces 17620-402-000 Chrome filler cap with gasketChrome filler cap with gasket installed; replaces 17620-402-000 and 17620-402-010.View part Honda CB Gas Cap Rubber Seal ~ Replaces 17631-329-003 Replacement filler-cap sealSeparate gas cap rubber seal, reference 17631-329-003; explicit 1970–72 CB100K application.View part

Let the cap’s condition determine the order

The chrome cap replaces 17620-402-000 or 17620-402-010 and includes a gasket installed. The separate rubber seal replaces 17631-329-003. Compare the cap and its sealing area before deciding between a complete cap and a seal-only repair; the two purchases are not automatically needed together.

Check replacement taps independently

The tank-to-petcock O-ring is for stock OEM valves, replacing 16997-273-006 or 16960-011-000. The alternative petcock in the wider grid has a longer body and changed outlet position on some models. Its CB100K application does not establish that it takes this stock-valve seal.

Ordering questions

Is a second gasket required with the complete chrome cap?

The chrome cap comes with its gasket installed. Consider the separate cap seal when retaining an identified compatible cap; do not add it just to complete the new cap’s package.

Can I use the stock-petcock O-ring with an OEM-style replacement tap?

The restriction is to a stock OEM petcock. Identify the replacement tap and confirm its body-to-tank seal requirement first; an OEM-style description and matching motorcycle year do not establish the same sealing arrangement.

What should I identify if the tank was changed before I bought the bike?

Record the filler opening, cap and petcock connection on the fitted tank. Compare those fittings individually; a tank from another model or an aftermarket tank can change both the cap and valve-seal choices.

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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