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1981 Honda CB750K Petcock & Tank Fittings

This 1981 CB750K selection contains a petcock, cap seal, tank mounting rubbers and emblem screws. It does not contain a complete tank or cap assembly. Identify whether the job involves fuel control, a seal or mounting support before choosing the corresponding part.

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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 CB750 CB650 rear fuel tank holder rubber 17613-425-000

Honda CB750 / CB650 Rear Fuel Tank Holder Rubber ~ Replaces 17613-425-000

$15.94 USD
02-6552
Secure the back end of your fuel tank with this Rear Fuel Tank Holder Rubber, a direct replacement for OEM #17613-425-000. One used per...
Honda CB750 CB650 CB400 gas cap rubber seal 17632-422-000

Honda CB750 / CB650 / CB400 Gas Cap Rubber Seal ~ Replaces 17632-422-000

$7.95 USD
20-0096
Replace your DOHC Honda gas cap rubber seal with this Gas Cap Rubber Seal, replacing OEM #17632-422-000.Key Features• Gas cap rubber seal• Replaces OEM...
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 CB750 CB650 fuel tank emblem screw set

Honda CB750 / CB650 Fuel Tank Emblem Screw Set

$4.95 USD
01-0121
Complete your fuel tank emblem installation with this Fuel Tank Emblem Screw Set of 4, a direct replacement for OEM #93700-04006-0G. Enough hardware for...
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1981 Honda CB750K · Petcock & tank fittings Buying guide

Match the 1981 petcock connection before ordering tank parts

Petcock 20-8041 lists the 1981 CB750K with an M18 x 1.0 tank connection. The cap seal and front and rear tank supports are separate products. Keep the valve, cap and support repairs distinct when building the order.

Parts to consider

1981 Honda CB900 / CB750 / CB650 Fuel Petcock ~ Replaces 16950-MA4-671 1981-application fuel petcockPetcock referencing 16950-MA4-671 and 16950-461-771, with M18 x 1.0 threads. Confirm the fitted tank connection.View part Honda CB750 / CB650 / CB400 Gas Cap Rubber Seal ~ Replaces 17632-422-000 Gas cap rubber sealSeparate cap seal replacing reference 17632-422-000. Match it to the cap currently fitted.View part Honda CB Front Fuel Tank Holder Rubber ~ Replaces 17611-425-000 Front tank holder rubberIndividual front support referencing 17611-425-000. The listing states two used per bike.View part

Related parts: Rear support for the fuel tank · Four screws for tank emblems

Check the thread even when the replacement looks familiar

The 1981 petcock listing specifies M18 x 1.0 and references 16950-MA4-671 and 16950-461-771. The 1982 CB750K petcock is a different listing with M20 x 1.0 threads. Both descriptions ask buyers to verify the actual connection. Compare the fitted tank rather than assuming adjacent years use the same valve.

Separate a cap seal from the mounting rubbers

The cap seal references 17632-422-000. Front tank supports reference 17611-425-000 and are sold individually; the rear support has reference 17613-425-000. Inspect each location before buying, because the sealing piece and mounting rubbers do not form one complete tank-accessory kit.

Questions before choosing parts

Can I use the 1982 CB750K petcock on this tank?

Do not assume interchangeability: the listed 1981 petcock has M18 x 1.0 threads, while the 1982 listing specifies M20 x 1.0. Check the tank fitted to your motorcycle, especially if it has been replaced, and resolve any mismatch before ordering.

Does a rubber part listed for several Hondas mean the cap seal fits those same bikes?

Each product has its own application. The front tank support covers a broader group of models than the featured cap seal. For this 1981 CB750K, match the cap seal by reference 17632-422-000 and the cap actually fitted; do not transfer the support rubber’s fitment to the seal.

How many front supports do I order when replacing both?

The front tank holder rubber is sold individually, with two used per bike in its listing. Replacing both therefore calls for two of that item. The rear support is a separate part, listed at one per bike, and the emblem screws are their own four-piece set.

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