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1970 Honda CB100K0 Tank Caps & Petcock Seals

Choose between a complete filler cap, a separate cap seal and a stock-petcock body gasket for your 1970 CB100K0. They serve different tank openings. Identify the fitted cap and valve before ordering, particularly when the tank or petcock has been replaced.

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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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1970 Honda CB100K0 · Tank Caps & Petcock Seals Buying guide

Separate the filler cap from the petcock joint

The chrome filler cap includes a gasket installed. A separate cap seal is also available, while the tank-to-petcock gasket is restricted to stock OEM valves. Identify which assembly needs attention before ordering.

Parts to consider

Honda CB Fuel Petcock Body O-Ring / Gasket ~ Replaces 16997-273-006 Stock petcock body sealStock-OEM petcock-to-tank gasket; references 16997-273-006 and 16960-011-000.View part Honda Gas Tank Filler Cap ~ Replaces 17620-402-000 Chrome tank filler capChrome cap supplied with its gasket installed; references 17620-402-000 and 17620-402-010.View part Honda CB Gas Cap Rubber Seal ~ Replaces 17631-329-003 Gas cap rubber sealSeparate replacement gas cap seal, reference 17631-329-003, for the 1970–72 CB100K.View part

Decide between the complete cap and its seal

The chrome cap replaces references 17620-402-000 and 17620-402-010 and comes with a gasket installed. The separate cap seal replaces 17631-329-003. Choose around the cap’s condition and fitted tank; do not automatically add another seal to a complete-cap order.

Keep the stock-petcock restriction in place

The petcock gasket fits between a stock OEM valve and tank, replacing 16997-273-006 or 16960-011-000. The separately offered replacement valve has a longer body and a differently located outlet on some models. That valve’s motorcycle application does not establish compatibility with this stock-valve seal.

Buying questions

Do I need a separate seal with the chrome filler cap?

The featured chrome cap comes with its gasket installed. A separate cap seal may be useful when retaining an existing compatible cap, but it should not be added automatically when buying the complete cap.

Can the petcock gasket be used on an aftermarket valve?

It is specified for stock OEM petcocks. Confirm the seal required by the actual replacement valve; shared CB100 application does not establish that the aftermarket valve uses the stock body-to-tank gasket.

What changes if the fuel tank has been replaced?

Identify the filler opening, cap and petcock connection on the replacement tank. Compare those assemblies before relying on the 1970 CB100K0 application; the original motorcycle year cannot identify fittings on a different 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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