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1981 Honda CB650C Custom Tank Fittings

Tank fittings for the 1981 CB650C should be checked at the tank rather than selected solely from the frame model. The petcock uses M18 × 1.0 threads, the cap includes a gasket and keys, and front support cushions are sold individually for their own mounting positions.

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Currently viewing Gas Tanks, Caps, Petcocks & Parts

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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 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 /...
Honda CB front fuel tank rubber cushion 17611-KE8-000

Front Fuel Tank Rubber Cushion ~ Replaces Honda OEM 17611-KE8-000

$5.50 USD
27-5520
This aftermarket front fuel tank rubber cushion replaces Honda OEM 17611-KE8-000 on the listed Honda CB-series applications. It mounts to the frame and supports...
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1981 Honda CB650C Custom · Tank Fittings Buying guide

Identify the valve separately from the cap and cushions

The offered valve, keyed cap and front rubber have separate reference numbers and package contents. Use those details to plan the order, particularly if the tank or cap has been replaced since the motorcycle was built.

Parts to consider

1981 Honda CB900 / CB750 / CB650 Fuel Petcock ~ Replaces 16950-MA4-671 1981 M18 petcockM18 × 1.0 tank thread; references 16950-MA4-671 and 16950-461-771.View part Honda CB Gas / Fuel Tank Filler Cap ~ Replaces 17620-460-067 Fuel tank cap and keysOEM-type cap supplied with a gasket and two keys; reference 17620-460-067.View part Front Fuel Tank Rubber Cushion ~ Replaces Honda OEM 17611-KE8-000 Front tank rubber cushionAftermarket cushion replacing reference 17611-KE8-000. Sold individually.View part

Identify the offered M18 valve

Petcock 20-8041 lists Honda replacement references 16950-MA4-671 and 16950-461-771. The package supplies one valve with the specified M18 × 1.0 tank connection.

Account for the cap’s supplied parts

Cap 65-6508 replaces reference 17620-460-067 and comes with a gasket and two keys. If the repair also needs mounting hardware, confirm that separately; the written package list does not establish which additional hardware is supplied.

Tank Fittings questions

Can I select a replacement valve just by matching the thread?

The selected valve has an M18 × 1.0 thread, but its buying guidance also calls for checking the sealing arrangement, outlet direction, hose size and lever clearance. Compare all of those with the fitted tank and valve before ordering; the thread is only one part of the match.

Can I keep using my ignition key with the replacement cap?

The cap comes with two keys. Its listing does not promise a match to an existing ignition key or offer a matching-key option, so confirm that requirement first if keeping one key for both locks matters.

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