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1980 Honda CB900C Custom Tank Caps & Petcocks

The tank fitted to your 1980 CB900C Custom determines which petcock and cap to buy. This year’s smaller-thread petcock has an explicit measurement check. The locking cap includes its gasket and keys, while front tank cushions are sold individually.

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Most orders ship same or next business day Fitment guarantee Listed for your exact model and year? We’ll make it right if it doesn’t fit as described. Mechanic-backed support Ask our team for help choosing the right Honda CB part.
Currently viewing Gas Tanks, Caps, Petcocks & Parts

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Honda CB front fuel tank holder rubber 17611-425-000

Honda CB Front Fuel Tank Holder Rubber ~ Replaces 17611-425-000

$7.87 USD
02-6551
Keep your fuel tank snugly mounted at the front with this Front Fuel Tank Holder Rubber, a direct replacement for OEM #17611-425-000. Fits the...
Honda CB900C CB750F fuel petcock 16950-438-305

1979-80 Honda CB900C / CB750F Fuel Petcock ~ Replaces 16950-438-305

$54.95 USD
20-8042
Replace your DOHC CB's smaller-thread fuel petcock with this Fuel Petcock, replacing OEM #16950-438-305 with M16 x 1.5 threads.Note: these bikes came with either...
Honda CB750C CB750SC CB900C CB1000C gas fuel tank cap 17620-460-067

Honda CB Gas / Fuel Tank Filler Cap ~ Replaces 17620-460-067

$44.95 USD
65-6508
Replace your gas tank cap with this OEM Type Gas/Fuel Tank Cap with gasket and 2 keys, replacing OEM #17620-460-067.Key Features• OEM-type gas /...
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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...
Honda CB750C CB900C fuel tank emblem screw set

Honda CB750C / CB900C Fuel Tank Emblem Screw Set

$3.50 USD
01-0123
Secure your fuel tank emblems with this Fuel Tank Emblem Screw Set of 4, replacing OEM #93500-04006-0G. Set includes four screws, enough to mount...
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1980 Honda CB900C Custom · Tank Caps & Petcocks Buying guide

Check the 1980 tank fitting and vent before replacing the petcock

A petcock, filler cap and tank support rubber solve different problems. Before replacing a valve, inspect the tank connection, fuel line and venting; a restriction upstream can mimic carburetor trouble. Fuel leaks must be corrected before the motorcycle is run.

Parts to consider

1979-80 Honda CB900C / CB750F Fuel Petcock ~ Replaces 16950-438-305 Smaller-thread petcockM16 × 1.5 petcock with a specified 14.6mm nut-thread measurement; compare the tank fitting and measurement method before ordering.View part Honda CB Gas / Fuel Tank Filler Cap ~ Replaces 17620-460-067 Locking tank capOEM-type cap supplied with a gasket and two keys; reference 17620-460-067.View part Honda CB Front Fuel Tank Holder Rubber ~ Replaces 17611-425-000 Front tank cushionSold individually; two front holder rubbers are specified per motorcycle.View part

Related parts: Tank-emblem screw set

Match the installed tank, not only the registration year

A replacement tank can change the petcock connection. Compare nominal thread size and pitch directly, as well as the sealing arrangement and hose outlet. The smaller 1980 listing’s measured nut diameter is not the same thing as its nominal M16 thread size.

Check the tank after the repair

Confirm that the cap latches securely and its seal sits evenly. Check the petcock and hose joints for leakage and verify the intended OFF, ON and reserve operation using the applicable service procedure. Correct hardened support rubbers or a strained hose before returning the motorcycle to use.

Buying questions

Can a blocked tank vent look like a carburetor fault?

Yes. Honda includes a blocked fuel-cap vent among causes of a lean mixture or restricted fuel supply. Check venting, the strainer and fuel line before buying jets or a carburetor kit.

Will matching the thread alone guarantee the petcock fits?

No. Also compare the sealing face, outlet and hose size, lever movement and clearance around the tank and frame. An earlier or replacement tank may differ from the original year-specific fitting.

What should be checked when fitting the replacement cap?

Compare the hinge, latch and sealing arrangement with the actual tank. The listed cap includes a gasket and two keys; confirm that both keys work, the latch closes and the tank vents correctly before riding.

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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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