1978 Honda CB750K Engine Repair Parts

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Honda CB750 starting clutch gear seal 25 x 33 x 4 91215-300-003

1969-78 Honda CB750 Starting Clutch Gear Seal ~ 25 x 33 x 4 ~ Replaces 91215-300-003

$5.80 USD

Replace your starting clutch gear seal with this Starting Clutch Gear Seal, 25 x 33 x 4, replacing OEM #91215-300-003. High-quality, made in Japan.Key...

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Honda CB750 black clutch cover face cover joker machine 11348-392-000

1969-78 Honda CB750 Black Clutch Cover Face Cover ~ Joker Machine ~ Replaces 11348-392-000

$139.95 USD

Add a blacked-out custom face to your clutch cover with this Joker Machine Black Clutch Cover Face Cover. Alloy gold mounting hardware included, replaces...

Honda CB750 cylinder head gasket 12251-300-050

1969-78 Honda CB750 Cylinder Head Gasket ~ Replaces 12251-300-050

$119.95 USD

Replace your SOHC CB750's cylinder head gasket with this Premium Athena Brand Cylinder Head Gasket, replacing OEM #12251-300-050.Key Features• Premium Athena cylinder head gasket•...

Honda CB750 black finned points cover joker machine 30370-300-020

1969-78 Honda CB750 Black Finned Points Cover ~ Joker Machine ~ Replaces 30370-300-020

$169.95 USD

Dress up your engine with this Joker Machine Brand Custom Black Finned Points Cover with a built-in rubber O-ring and gold-colored mounting hardware. Replaces...

Honda CB750F CB750K countershaft sprocket oil seal 29.8 x 62 x 7 91205-405-005

1977-78 Honda CB750F / CB750K Countershaft Sprocket Oil Seal ~ 29.8 x 62 x 7 ~ Replaces 91205-405-005

$19.95 USD

Replace your countershaft sprocket oil seal with this Countershaft Sprocket Oil Seal, 29.8 x 62 x 7, replacing OEM #91205-405-005. High-quality, made in Japan.Key...

1969-78 Honda CB750 Cam Sprocket ~ Replaces 14321-392-000

$44.95 USD

Replace your cam sprocket with this Cam Sprocket, replacing OEM #14321-392-000 / #14321-300-010.Key Features• Cam sprocket• Replaces OEM #14321-392-000 / #14321-300-010• Honda part name:...

Honda CB750 2ND oversize piston ring set +0.50mm 13031-392-004

1976-78 Honda CB750 Piston Ring Set ~ 2nd Oversize +0.50mm

$23.45 USD

Take your late-'70s CB750 to a 0.50mm oversize with this 2nd Oversize Piston Ring Set (+0.50mm), Japanese made to superior quality and replacing OEM...

Honda CB750 engine oil seal kit made in japan with 7 seals 91205-405-005

1977-78 Honda CB750 Engine Oil Seal Kit

$34.95 USD

Seal up your 1977-78 CB750 rebuild with this 7-piece Engine Oil Seal Kit, superior OEM quality and made in Japan. Purpose-built for the late-'70s...

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Honda CB750A CB750K Honda exhaust valve 14721-300-015

1978 Honda CB750A / CB750K Genuine Honda Exhaust Valve ~ OEM 14721-300-015

$89.95 USD

Upgrade or restore your classic Honda motorcycle with this Genuine Honda Exhaust Valve — precision‑engineered and made in Japan. This authentic OEM part #14721‑300‑015...

1969-78 Honda CB750 Chrome Kick Starter Shaft Cover ~ Joker Machine

$49.95 USD

Clean up your CB750 with this Joker Machine Brand Chrome Kick Starter Shaft Cover. Eliminates the heavy kick starter arm and cleans up the...

Honda CB750 CB450 CB400 CB360 CB77 valve guide clip 12211-250-310

Honda CB Valve Guide Clip ~ Replaces 12211-250-310

$1.95 USD

Replace your valve guide clip with this Valve Guide Clip, replacing OEM #12211-250-310.Sold each, order the quantity you require.Key Features• Valve guide clip• Replaces...

1969-78 Honda CB750 Black Kick Starter Shaft Cover ~ Joker Machine

$49.95 USD

Eliminate the heavy kick starter arm and clean up the look of the splined shaft with this Joker Machine Black Kick Starter Shaft Cover....

Honda CB750 valve rocker arm a 14431-300-030

1969-78 Honda CB750 Valve Rocker Arm A ~ Replaces 14431-300-030

$74.95 USD

Upgrade or restore your classic Honda motorcycle with this Valve Rocker Arm A — high‑quality replacement engineered and made in Japan. This component replaces...

Honda CB750 oil pump gasket 15135-300-010

1969-78 Honda CB750 Oil Pump Gasket ~ Replaces 15135-300-010

$6.60 USD

Replace your SOHC CB750 oil pump gasket with this Oil Pump Gasket, replacing OEM #15135-300-010.Key Features• Oil pump gasket• Replaces OEM #15135-300-010• Honda part...

Honda CB750 heavy duty BS05MH cam chain rivet link for 52-5010 cam chain

Heavy Duty BS05MH Cam Chain Rivet Link for 52-5010 Chain

$4.61 USD

Install your heavy-duty cam chain with this Heavy Duty Cam Chain Rivet Link, designed specifically for the BS05MH-spec chain. Used to complete installation of...

Honda CB750 oil filter cover 15411-300-010

Honda CB750 Oil Filter Cover ~ Replaces OEM 15411-300-010

$37.95 USD

Aftermarket finned oil filter cover for select Honda CB750 models. Replaces a damaged, cracked or missing original oil filter cover at the front of...

New

Honda CB750A CB750K Honda intake valve 14711-300-015

1978 Honda CB750A / CB750K Genuine Honda Intake Valve ~ OEM 14711-300-015

$89.95 USD

Upgrade or restore your classic Honda motorcycle with this Genuine Honda Intake Valve — precision‑engineered and made in Japan. This authentic OEM part #14711‑300‑015...

Honda CB750 1ST oversize piston ring set +0.25mm 13021-392-004

1976-78 Honda CB750 Piston Ring Set ~ 1st Oversize +0.25mm

$23.45 USD

Step up to a 0.25mm oversize with this 1st Oversize Piston Ring Set (+0.25mm), Japanese made to superior quality and replacing OEM Ref. #13021-392-000...

Honda CB750 valve rocker arm b 14432-300-030

1969-78 Honda CB750 Valve Rocker Arm B ~ Replaces 14432-300-030

$74.95 USD

Upgrade or restore your classic Honda motorcycle with this Valve Rocker Arm B — precision‑engineered and made in Japan. This high‑quality replacement is designed...

Honda CB750F CB750K 61mm standard piston kit 13101-392-020

76 CB750F / 77-78 CB750K Piston Kit ~ 61mm Standard Bore

$59.95 USD

This aftermarket 61mm standard-bore piston kit replaces Honda OEM 13101-392-020 for the listed 1976 CB750F and 1977-1978 CB750K piston applications. This is the stock-size...

Honda CB750F CB750K 61mm standard piston 13101-392-020

76 CB750F / 77-78 CB750K Piston ~ 61mm Standard Bore

$44.95 USD

This aftermarket 61mm standard-bore piston replaces Honda OEM 13101-392-020 for the listed Honda CB750 piston applications. This is the stock-size piston for standard-bore cylinders...

1969-78 Honda CB750 Oil Tube Plug ~ Replaces 15337-300-010

$10.95 USD

Replace your oil tube plug with this Oil Tube Plug, replacing OEM #15337-300-010.Key Features• Oil tube plug• Replaces OEM #15337-300-010• Honda part name: Plug,...

New

1969-78 Honda CB750 Joker Machine Oil Tank Mounting Bushing Set/3

$79.95 USD

Clean up your exposed stock oil tank with this Joker Machine Oil Tank Mounting Bushing Set of 3. Designed for builds running no oil...

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1978 Honda CB750K · Engine Buying guide

Plan the repair around the installed engine

The standard piston kit, late-application oil seal set and paper filter illustrate three different jobs. Each has its own contents and application checks, rather than forming a single complete overhaul package.

Parts to consider

76 CB750F / 77-78 CB750K Piston Kit ~ 61mm Standard Bore

Standard-bore piston kitAftermarket 61 mm standard-bore kit replacing 13101-392-020: one piston, pin, clips and five-ring set for one cylinder.View part

Seven-piece engine oil seal setSeven shaft seals for the listed 1977–78 application, including countershaft reference 91205-405-005 at 29.8 × 62 × 7.View part

Honda CB Oil Filter ~ Replaces 15410-426-010

Original-type paper oil filterReplacement filter element. The accompanying O-rings, spring and washers are offered separately.View part

Decide what is being opened

Compare the sealing locations opened by the repair with the actual contents of each package. The top-end gasket set names head, base and cam-cover gaskets along with its smaller sealing pieces; the shaft-seal kit lists different engine locations.

Identify any previous changes

Check the engine and installed components when the motorcycle history is uncertain. This inventory includes stock-application parts and custom covers or oil accessories. Standard-bore pistons and listed shaft seals need comparison with the actual engine, while altered filter hardware needs its own application check.

Common questions

Why compare the piston-only product with the piston kit when their reference is the same?

Both use replacement reference 13101-392-020 and a listed 61 mm standard-bore application. The piston-only product excludes rings, pin and clips, whereas the kit supplies them. Choose around the measured cylinder and parts required rather than using the shared reference as a package-contents check.

Which shaft locations does the seven-piece oil-seal kit cover?

It lists one seal each for the countershaft, clutch arm, shift shaft, crank, starting-clutch gear, kickstart and tach drive. Compare those named locations with the repair scope; the seven-piece title does not establish that every possible engine seal is supplied.

What else should I check for an oil-filter purchase?

The paper filter description says O-rings, springs and washers are separate. Compare those pieces and the fitted housing with the available service listings. If the original housing has been changed, verify the filter arrangement before buying an original-type element.

Not sure which part you need?

Send your model and year, plus photos of your existing part and any changes to the original setup.

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