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1981 Honda CB900C — Réservoirs, bouchons, robinets et pièces

Check the fuel outlet and filler arrangement on the tank fitted to your 1981 CB900C Custom. The listed petcock uses M18 × 1.0 threads, while the locking cap includes a gasket and two keys. Front tank cushions are separate, individually supplied support pieces.

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Honda CB900 CB750 CB650 fuel petcock 16950-MA4-671

1981 Honda CB900 / CB750 / CB650 Fuel Petcock ~ Replaces 16950-MA4-671

$44.95 USD
20-8041
Replace your 1981 DOHC CB's fuel petcock with this Fuel Petcock, replacing OEM #16950-MA4-671 / #16950-461-771 with M18 x 1.0 threads. Please verify the...
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 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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1981 Honda CB900C Custom · Fuel Tank Service Parts Buying guide

Distinguish the tank valve from the 1981 automatic fuel control

The listed M18 × 1.0 petcock controls the tank outlet. The 1981 Custom also has a separate vacuum-operated fuel-line diaphragm near the carburetor bank. Identify whether the fault is at the tank, cap, hose or automatic valve before replacing a part.

Parts to consider

1981 Honda CB900 / CB750 / CB650 Fuel Petcock ~ Replaces 16950-MA4-671 M18 × 1.0 petcock1981 Custom application; references 16950-MA4-671 and 16950-461-771. Verify the tank thread.Voir la pièce 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.Voir la pièce Honda CB Front Fuel Tank Holder Rubber ~ Replaces 17611-425-000 Front tank cushionSold individually; two are specified per motorcycle.Voir la pièce

Pièces connexes : Four tank-emblem screws

Keep the manual and automatic valves separate

Confirm the actual M18 × 1.0 tank connection, outlet direction and clearance before choosing the featured petcock. If the complaint is poor fuel delivery, Honda’s 1981 supplement also checks the downstream diaphragm and its vacuum and vent tubes. A new tank valve cannot correct a blocked diaphragm hose.

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.

Does the 1981 automatic valve make the manual petcock unnecessary?

They are separate parts with separate functions and service checks. Retain the correct fuel-system arrangement and use the manual valve as Honda directs. Diagnose the automatic diaphragm and its hose routing rather than assuming a tank-petcock replacement services both.

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