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1978 Honda CB550K Fuel-Tank Caps, Seals & Mounting Rubbers

The 1978 Honda CB550K tank-fitting choices include a filler cap, separate cap seal and front and rear mounting rubbers. Identify the tank actually installed before comparing these parts. Check whether the selected cap already supplies its gasket and distinguish cushion requirements from the purchase quantity.

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Currently viewing Gas Tanks, Caps, Petcocks & Parts

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Honda CB front fuel tank holder rubber 17611-283-010

Honda CB Front Fuel Tank Holder Rubber ~ Replaces 17611-283-010

$7.87 USD
02-6534
Secure the front of your fuel tank with this Front Fuel Tank Holder Rubber, a direct replacement for OEM #17611-283-010. Fits a broad range...
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...
Honda CB750 CB550 CB400 filler cap 17620-399-010

Honda CB750 / CB550 / CB400 Filler Cap ~ Replaces 17620-399-010

$69.95 USD
73-0079
Replace your gas tank cap with this OEM Style Gas / Fuel Tank Cap with rubber gasket already installed, replacing OEM #17620-399-010.Note: does not...
New
Honda CB550 CB500 CB360 rear fuel tank holder rubber 17613-286-000

Honda CB Rear Fuel Tank Holder Rubber ~ Replaces 17613-286-000

$9.95 USD
12-0133
Restore proper rear fuel tank mounting on your mid-'70s twin or four with this Rear Fuel Tank Holder Rubber, a direct replacement for OEM...
New
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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...
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1978 Honda CB550K · Gas Tanks, Caps, Petcocks & Parts Buying guide

Compare cap contents and each tank mounting position

The OEM-style cap arrives with a rubber gasket but no attached chain. Front and rear tank cushions carry different references; the front product explicitly states two used per bike while being sold individually.

Parts to consider

Honda CB750 / CB550 / CB400 Filler Cap ~ Replaces 17620-399-010 OEM-style filler cap with fitted gasketReference 17620-399-010; rubber gasket pre-installed and no attached chain supplied.View part Honda CB Front Fuel Tank Holder Rubber ~ Replaces 17611-283-010 Front fuel-tank cushion rubberReference 17611-283-010; two used per bike, explicitly sold individually.View part Honda CB Rear Fuel Tank Holder Rubber ~ Replaces 17613-286-000 Rear fuel-tank cushion rubberRear mounting component with reference 17613-286-000; compare the fitted tank arrangement.View part

Related parts: Separate cap seal for a retained cap · Separately sold tank-emblem clamp nut

Check cap-and-gasket overlap before combining products

The OEM-style cap includes its rubber gasket already installed and excludes an attached chain. A separate cap rubber seal has its own replacement reference. Compare the retained cap and intended work with those descriptions before adding a seal to an order for a new cap that already supplies its gasket.

Keep the two cushion positions distinct

The front cushion references 17611-283-010 and expressly states two used per bike, sold individually. The rear cushion references 17613-286-000 but does not give the same quantity statement. Compare the mounting positions on the actual tank before choosing parts or applying the front product’s count to a rear purchase.

Common ordering questions

Is the replacement cap described as genuine Honda?

It is described as OEM style, with reference 17620-399-010 and a pre-installed rubber gasket. That replacement reference and styling statement do not identify it as a genuine Honda-manufactured cap; compare the supplied design with the fitted tank.

Do two front cushions arrive in one purchase?

The front listing says two are used per bike and explicitly says sold individually. Count the front cushions required for the planned replacement, then choose the number of individual pieces needed rather than treating that requirement as a two-piece sales package.

What does the emblem hardware listing establish?

It describes an individually sold fuel-tank emblem clamp nut with references 87311-634-600 and 87311-516-000. Compare the fitted emblem and its hardware before adding it; a tank-cap or mounting-rubber purchase does not include that separately described emblem component.

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