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1978 Honda CB750K Tank Caps & Fittings

The available tank-related items for this 1978 CB750K include a filler cap, outer filler lid, seal, trim and mounting pieces. They are separate parts rather than a complete tank package. Identify the piece needing replacement, then compare the installed tank style and finish.

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Currently viewing Gas Tanks, Caps, Petcocks & Parts

Honda motorcycle parts

Choose your model and year to see parts listed for your bike.

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 rear fuel tank holder rubber 17613-399-000

Honda CB750 Rear Fuel Tank Holder Rubber ~ Replaces 17613-399-000

$14.95 USD
02-6536
Restore proper rear fuel tank mounting on your late-'70s CB750 with this Rear Fuel Tank Holder Rubber, a direct replacement for OEM #17613-399-000. One...
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...
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...
New
Honda CB750A CB750K gas tank chrome trim moulding set 2 17542-405-000

1977-78 Honda CB750A / CB750K Gas Tank Chrome Trim / Moulding Set/2 ~ Replaces 17542-405-000 & 17541-405-000

$89.95 USD
99-5560
Upgrade or restore your classic Honda motorcycle with this Gas Tank Chrome Trim / Moulding Set — precision‑designed to fit stock Honda gas tanks....
Honda CB750K CB750A fuel filler lid 17531-405-000ZB

Fuel Filler Lid / Gas Tank Cover ~ Genuine Honda 17531-405-000ZB

$99.95 USD
99-5247
This genuine Honda fuel filler lid / gas tank filler cover is Honda OEM 17531-405-000ZB (Excel Black) for the listed 1977-1978 Honda CB750K and...
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1978 Honda CB750K · Tank caps & fittings Buying guide

Distinguish the filler cap, outer lid and tank fittings

The cap includes a gasket but excludes a retaining chain. The genuine Honda outer lid has its own finish suffix and exclusions. Check those details before combining a cap, lid or trim order.

Parts to consider

Honda CB750 / CB550 / CB400 Filler Cap ~ Replaces 17620-399-010 Filler cap with installed gasketOEM-style filler cap referencing 17620-399-010, with its rubber gasket installed. No retaining chain is included.View part Fuel Filler Lid / Gas Tank Cover ~ Genuine Honda 17531-405-000ZB Genuine Honda black filler lidGenuine Honda 17531-405-000ZB in Excel Black. Lid only; latch, lock, hinge hardware, seal, tank molding and related mounting hardware are excluded.View part 1977-78 Honda CB750A / CB750K Gas Tank Chrome Trim / Moulding Set/2 ~ Replaces 17542-405-000 & 17541-405-000 Two-piece chrome tank trimOne trim strip for each side of the stock tank. The listing states it is not an exact replica of the original trim.View part

Related parts: Separate cap seal, reference 17631-329-003 · Rear tank rubber, reference 17613-399-000 · Four emblem screws, reference 93700-04006-0G

Check the retained closure hardware before ordering the outer lid

Inspect the latch, lock and hinge pieces that will be reused with the genuine outer lid. The separate filler cap closes a different part of the opening. Choose by the damaged component and its reference rather than assuming either purchase renews the entire assembly.

Compare the petcock’s thread and actual hose route

Petcock 20-8037 replaces 16950-393-015 and lists M16 × 1.5 threads, with the 1978 CB750K included under its application note. Verify the tank thread and outlet clearance on the installed tank. The description’s explicit outlet-direction comparison names the CB750F; do not turn that into a factory routing claim for the K.

Common questions

When could a seal-only purchase avoid replacing the complete filler cap?

The separate rubber seal replaces 17631-329-003 and lists the 1977–78 CB750K. Compare it with the seal and condition of the retained cap. The complete cap replacing 17620-399-010 already includes a gasket, so check the chosen repair before ordering both packages.

What does the ZB suffix mean on the Honda filler lid?

This listing identifies 17531-405-000ZB as Excel Black. It instructs buyers to compare the original number, colour suffix, finish and tank style. Use that information rather than choosing only by the base number or the motorcycle model year.

What dimensions and appearance limits does the replacement tank trim list?

The two strips replace 17542-405-000 and 17541-405-000 and measure approximately 21.5 inches long by 5/8 inch wide. The listing describes fit to the stock tank but explicitly says the trim is not an exact original replica. Compare the tank edge and intended restoration appearance before ordering.

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