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1975 Honda CB125S2 Tank Caps & Seals

Choose tank-area parts for your 1975 Honda CB125S2 by identifying the fitting being repaired. A chrome filler cap comes with its gasket installed, a separate seal can serve a matching retained cap, and the petcock O-ring addresses the tap-to-tank joint.

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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...
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Honda CB1000 CB900 CB750 fuel tank emblem clamp nut 87311-634-600

Honda CB Fuel Tank Emblem Clamp Nut ~ Replaces 87311-634-600

$6.25 USD
99-5267
Secure your fuel tank emblem properly with this Fuel Tank Emblem Clamp Nut, designed as a direct replacement for the original Honda hardware. This...
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...
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1975 Honda CB125S2 · Tank Caps & Seals Buying guide

Choose a cap assembly or a seal for the existing fitting

Keep the filler-cap seal and petcock body O-ring on separate lines of the order. Check the condition of the cap itself before choosing a complete replacement instead of a separate sealing piece.

Parts to consider

Honda Gas Tank Filler Cap ~ Replaces 17620-402-000 Chrome filler cap with gasketChrome tank filler cap with its gasket installed; references 17620-402-000 and 17620-402-010.View part Honda CB Gas Cap Rubber Seal ~ Replaces 17631-329-003 Separate gas-cap rubber sealReplacement gas-cap rubber seal for reference 17631-329-003. Match to the cap being retained.View part Honda CB Fuel Petcock Body O-Ring / Gasket ~ Replaces 16997-273-006 Petcock body O-ringSeals the joint between a stock OEM petcock body and the tank; references 16997-273-006 and 16960-011-000.View part

Related parts: Individual tank-emblem clamp nut

Avoid doubling up on the new cap’s gasket

The chrome filler cap arrives with its gasket installed. The separate rubber seal replaces reference 17631-329-003 and is useful when retaining a matching cap. Inspect the cap and tank opening first, then choose the assembly or seal needed for that repair.

Identify the tap joint and emblem fixing independently

The petcock O-ring seals a stock OEM tap body against the tank; it does not establish compatibility with an aftermarket tap. The linked emblem clamp nut is sold individually and replaces 87311-634-600 or 87311-516-000. Count those fasteners independently of the seals.

Buying questions

Do I need a separate gasket when ordering the chrome cap?

The chrome filler cap is supplied with a gasket already installed. Order the separate cap seal only for another identified need, such as renewing the seal in a matching cap that you plan to retain.

Will the body O-ring suit an aftermarket fuel tap?

Its stated application is for a stock OEM petcock at the body-to-tank joint. Identify an aftermarket tap and its own sealing arrangement before choosing a replacement; the original motorcycle year does not settle that changed fitting.

Are the tank-emblem clamp nuts supplied for both emblems?

The linked clamp nut is sold individually. Check the attachment points on the fitted emblems and count the missing or damaged fasteners, using references 87311-634-600 and 87311-516-000 to identify the required type.

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Send your model and year, plus photos of your existing part and any changes to the original setup.

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