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1980 Honda CB900C Custom Engine Parts

An oil change and a cylinder rebuild call for very different parts on your 1980 CB900C Custom. Start with the repair location, then check housing type, measured piston size and package contents before expanding the order to internal components.

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Honda CB1100 CB1000 CB900 CB750 CB650 oil filter 15410-426-010

Honda CB Oil Filter ~ Replaces 15410-426-010

$7.95 USD
15-0002
Service your classic Honda with this Stock-Type Oil Filter Element (paper filter), replacing OEM #15410-426-010 / #15410-422-004. Exceptionally broad fitment covering the full SOHC...
Honda CB1100 CB1000 CB900 CB750 oil filter o-rings

Honda CB1100/CB1000/CB900/CB750 Oil Filter O-Rings

$3.50 USD
15-0050
Fit fresh O-rings during an oil filter change with this Oil Filter O-Ring Set. Designed for the factory-type filter housing assembly and pairs with...
Honda CB1100 CB1000 CB900 CB750 oil filter washer set 15414-300-000

Honda CB Oil Filter Washer Set ~ Replaces 15414-300-000

$7.95 USD
15-0039
Fit oil filter washers with this Oil Filter Washer 5-pack, replacing OEM #15414-300-000. Used with original-type paper oil filter elements. Exceptionally broad fitment across...
Honda CB1100 CB1000 CB900 CB750 CB650 oil filter spring 15415-300-000

Honda CB Oil Filter Spring ~ Replaces 15415-300-000

$2.95 USD
15-0055
Replace the spring inside your oil filter housing with this Oil Filter Spring, replacing OEM #15415-300-000. Matches the fitment of our #15-0002 oil filter...
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Honda CB1100 CB1000 oil filter pack of 3 15410-426-010

Honda CB Oil Filter Pack of 3 (Volume Deal!) ~ Replaces 15410-426-010

$18.95 USD
15-0024
Keep your engine protected with this Pack of 3 Stock Type Oil Filter Elements, designed as direct replacements for the original Honda paper oil...
Honda CB1100 CB1000 CB900 CB750 alternator cover gasket 11691-425-000

Honda CB1100 / CB1000 / CB900 / CB750 Alternator Cover Gasket ~ Replaces 11691-425-000

$12.64 USD
12-5008
Replace the alternator cover gasket on your DOHC CB with this Alternator Cover Gasket, replacing OEM #11691-425-000. Fits the 1979-82 CB750 family, CB750SC Nighthawk,...
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Honda CB1100 CB1000 chrome spin on oil filter (cover + oil filter)

Honda CB Chrome Spin On Oil Filter (Cover + Oil Filter)

$32.91 $21.95 USD
You save $10.96
15-1006
Simplify oil service with this Chrome Spin-On Oil Filter, replacing your stock OEM housing, filter bolt, and paper element filter with a modern spin-on...
Honda CB1100 CB1000 CB900 CB750 valve cover gasket 12391-425-010

Honda CB1100 / CB1000 / CB900 / CB750 Valve Cover Gasket ~ Replaces 12391-425-010

$32.95 USD
12-1002
Replace your DOHC CB's valve cover gasket with this Valve Cover Gasket, replacing OEM #12391-425-010. Fits the 1979-82 CB750 family, CB750SC Nighthawk, CB900 family,...
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Honda CB1100 CB1000 CB900 CB750 left crankcase cover gasket 11395-425-306

Honda CB1100 / CB1000 / CB900 / CB750 Left Crankcase Cover Gasket ~ Replaces 11395-425-306

$14.95 USD
18-7055
Replace your DOHC CB's left crankcase (generator) cover gasket with this Generator Cover Gasket, replacing OEM #11395-425-306.Key Features• Left crankcase / generator cover gasket•...
Honda CB Piston Pin Clips 15mm Pk/2 ~ Replaces 94601-15000

Honda CB Piston Pin Clips 15mm Pk/2 ~ Replaces 94601-15000

$1.95 USD
05-7201
Secure your piston pins with this 2-pack of 15mm Piston Pin Clips, Japanese made to superior quality and replacing OEM Ref. #94601-15000. Exceptionally broad...
Honda CB1100 CB1000 CB900 CB750 oil pan gasket 11398-425-306

Honda CB1100 / CB1000 / CB900 / CB750 Oil Pan Gasket ~ Replaces 11398-425-306

$15.94 USD
18-7053
Replace your DOHC CB's oil pan gasket with this Oil Pan Gasket, replacing OEM #11398-425-306. Broad fitment across the CB750A Hondamatic, full 1979-82 CB750...
Honda CB1100 CB1000 CB900 CB750 CB450 magnetic oil drain plug

Honda CB Magnetic Oil Drain Plug

$10.95 USD
15-0014
Catch steel debris on oil changes with this Magnetic Oil Drain Plug, 14mm diameter x M1.5, replacing OEM #92800-14000. Fits the CB750A Hondamatic, full...
Honda CB1100 CB1000 CB900 exhaust headpipe gasket (each) 18291-MM5-860

Honda CB Exhaust Headpipe Gasket (Each) ~ Replaces 18291-MM5-860

$6.84 USD
18-7013
Replace one cylinder-head-to-exhaust-headpipe gasket on your big-bore Honda with this Cylinder Head to Exhaust Headpipe Gasket, 1 piece, replacing OEM #18291-MM5-860. Exceptionally broad fitment...
Honda CB1100 CB1000 CB900 CB750 oil filter washer each 15414-300-000

Honda CB Oil Filter Washer ~ Each ~ Replaces 15414-300-000

$2.95 USD
15-0042
Oil filter washer designed to replace the original Honda component, matching OEM reference 15414-300-000. Used to create a proper seal at the oil filter...
Honda CB1100 CB1000 CB900 CB750 CB550 oil filter bolt 15420-300-020

Honda CB Oil Filter Bolt ~ Replaces 15420-300-020

$24.95 USD
15-3020
Replace your stock oil filter bolt with this Oil Filter Bolt, replacing OEM #15420-300-020. Broad fitment across the full SOHC/DOHC CB750, CB900/CB1000/CB1100, CB500/CB550, and...
Honda CB1100 CB1000 CB900 CB750 clutch cover gasket 11396-425-306

Honda CB1100 / CB1000 / CB900 / CB750 Clutch Cover Gasket ~ Replaces 11396-425-306

$22.95 USD
12-5042
Rebuild your DOHC CB's clutch cover with this Clutch Cover Gasket, replacing OEM #11396-425-306. Fits the 1979-82 CB750 family, CB750SC Nighthawk, CB900 family, CB1000C,...
Honda CB1100 CB1000 shift shaft oil seal 12.5 x 25 x 8 91204-425-003

Honda CB Shift Shaft Oil Seal ~ 12.5 x 25 x 8 ~ Replaces 91204-425-003

$4.61 USD
73-0968
Replace your shift shaft oil seal with this Shift Shaft Oil Seal, 12.5 x 25 x 8, replacing OEM #91204-425-003. High-quality, made in Japan.Key...
Honda CB1100 CB1000 CB900 CB750 spark advancer cover gasket 30372-425-000

Honda CB1100 / CB1000 / CB900 / CB750 Spark Advancer Cover Gasket ~ Replaces 30372-425-000

$7.95 USD
18-7059
Replace your DOHC CB's spark advancer cover gasket with this Spark Advancer Cover Gasket (rubber O-ring), replacing OEM #30372-425-000.Key Features• Spark advancer cover gasket...
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Honda CB1100 CB1000 CB900 CB750 drain plug washer

Honda CB1100/CB1000/CB900/CB750 Drain Plug Washer

$1.75 USD
15-0000
Replace your oil drain plug washer with this 14mm x 20mm x 1mm Drain Plug Washer. Broad fitment across the CB750A Hondamatic, the full...
Honda CB1100 CB1000 tach drive oil seal 4.8 x 14.5 x 5 91256-425-003

Honda CB Tach Drive Oil Seal ~ 4.8 x 14.5 x 5 ~ Replaces 91256-425-003

$4.95 USD
73-0964
Replace your tach drive oil seal with this Tach Drive Oil Seal, 4.8 x 14.5 x 5, replacing OEM #91256-425-003. High-quality, made in Japan.Key...
New
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Honda CB1100 CB1000 CB900 CB750 oil filter pack of 5 15410-426-010

Honda CB Oil Filter Pack of 5 (Best Deal!) ~ Replaces 15410-426-010

$27.95 USD
15-0025
Keep your engine properly protected with this Pack of 5 Stock Type Oil Filter Elements, designed as direct replacements for the original Honda paper...
Honda CB1100 CB1000 CB900 CB750 valve shim 2.70

Honda CB1100 / CB1000 / CB900 / CB750 Valve Shim ~ 2.70

$8.19 USD
17-9270
Tune your valve clearances with this Valve Shim, 2.70 size, 25mm diameter.Sold each, order the quantity you need.Key Features• Valve shim• 2.70 size• 25mm...
Honda CB1100 CB1000 CB900 CB750 DOHC screw set

Honda CB1100 / CB1000 / CB900 / CB750 DOHC Screw Set

$39.95 USD
73-0099
Refresh DOHC carb hardware top to bottom with this 71-Piece DOHC Screw Set. Includes front stay plate screws (8), CV cap screws (8), throttle...
Honda CB1100 CB1000 CB900 CB750 valve shim 2.65

Honda CB1100 / CB1000 / CB900 / CB750 Valve Shim ~ 2.65

$8.19 USD
17-9265
Dial in valve clearances with this Valve Shim, 2.65 size, 25mm diameter.Sold each, order the quantity you need.Key Features• Valve shim• 2.65 size• 25mm...
Honda CB1000 CB900 CB750 spark advancer cover screw set 93700-06025-0A

Honda CB1000 / CB900 / CB750 Spark Advancer Cover Screw Set ~ Replaces 93700-06025-0A

$3.50 USD
73-0900
Replace your spark advancer cover screws with this Spark Advancer Cover Screw Set of 3 in 6x25 size, replacing OEM #93700-06025-0A.Note: the 1980 bikes...
Honda CB1100 CB1000 CB900 CB750 valve shim 2.75

Honda CB1100 / CB1000 / CB900 / CB750 Valve Shim ~ 2.75

$8.19 USD
17-9275
Adjust your valve clearances with this Valve Shim, 2.75 size, 25mm diameter.Sold each, order the quantity you need.Key Features• Valve shim• 2.75 size• 25mm...
Honda CB750 CB900 CB1000C engine oil seal kit made in japan with 6 seals 91256-425-003

1979-83 Honda CB750 / CB900 / CB1000C Engine Oil Seal Kit

$44.95 USD
01-9034
Seal up your DOHC-era CB's engine rebuild with this 6-piece Engine Oil Seal Kit. Superior OEM quality, made in Japan, and built for the...
Honda CB1100 CB1000 CB900 CB750 camshaft holder seal 91311-425-000

Honda CB1100 / CB1000 / CB900 / CB750 Camshaft Holder Seal ~ Replaces 91311-425-000

$5.50 USD
18-7066
Replace your DOHC CB's camshaft holder seal with this Camshaft Holder Rubber Seal (triangular piece with rounded corners), replacing OEM #91311-425-000. One piece required...
Honda CB1100 CB1000 CB900 CB750 valve shim 2.80

Honda CB1100 / CB1000 / CB900 / CB750 Valve Shim ~ 2.80

$9.38 USD
17-9280
Fit a 2.80 valve shim on your DOHC CB with this Valve Shim, 2.80 size, 25mm diameter.Sold each, order the quantity you need.Key Features•...
Honda CB1100 CB1000 CB900 CB750 valve shim 2.85

Honda CB1100 / CB1000 / CB900 / CB750 Valve Shim ~ 2.85

$9.38 USD
17-9285
Tune your valve clearances with this Valve Shim, 2.85 size, 25mm diameter.Sold each, order the quantity you need.Key Features• Valve shim• 2.85 size• 25mm...
Honda CB1100 CB1000 CB900 oil passage cap w o-ring 15331-300-000

Honda CB Oil Passage Cap with O-Ring ~ Replaces 15331-300-000

$29.95 USD
73-0077
Replace an oil passage cap with this Oil Passage Cap with O-Ring, replacing OEM #15331-300-000 (cap) and #94608-40000 (O-ring).Note: sold each, order the quantity...
Honda CB750 CB900 CB1100F DOHC cam chain tensioner b 14530-MG5-670

Honda CB750 / CB900 / CB1100F DOHC Cam Chain Tensioner B ~ Replaces 14530-MG5-670

$49.95 USD
07-0192
Replace your DOHC CB's smaller cam chain tensioner with this Cam Chain Tensioner "B", replacing OEM #14530-MG5-670 / #14530-425-000 / #14530-425-010 / #14530-MG1-670. A...
Honda CB1000 CB900 CB750 cam chain tensioner spring "b" 14538-425-000

Honda CB1000 / CB900 / CB750 Cam Chain Tensioner Spring "B" ~ Replaces 14538-425-000

$9.95 USD
73-0855
Replace your cam chain tensioner spring with this Cam Chain Tensioner Spring "B", the spring for the smaller cam chain tensioner ("B"). Replaces OEM...
Honda CB900 CB750 cam chain tensioner spring "a" 14514-425-010

1979-83 Honda CB900 / CB750 Cam Chain Tensioner Spring "A" ~ Replaces 14514-425-010

$5.80 USD
29-7007
Replace your DOHC main cam chain tensioner spring with this Cam Chain Tensioner Spring "A", for the larger main cam chain tensioner ("A"). Replaces...
Honda CB750 CB900 CB650 cam cover seal 90541-425-000

Honda CB750 / CB900 / CB650 Cam Cover Seal

$11.95 USD
01-0116
Keep oil where it belongs with this Cam Cover Seal, a direct replacement for OEM #90541-425-000. Fits a wide range of late-'70s through early-'80s...
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Honda CB1100 CB1000 CB900 CB750 valve shim 2.60

Honda CB1100 / CB1000 / CB900 / CB750 Valve Shim ~ 2.60

$8.19 USD
17-9260
Fit a 2.60 valve shim on your DOHC CB with this Valve Shim, 2.60 size, 25mm diameter.Sold each, order the quantity you need.Key Features•...
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Honda CB valve tappet cover rocker cap 12361-300-000

Honda CB Valve Tappet Cover / Rocker Cap ~ Replaces 12361-300-000

$6.95 USD
01-9980
Dress up your Honda's top end with this Valve Tappet Cover (Rocker Cap), an aftermarket finned chrome-plated replacement for OEM #12361-300-000. Fits an exceptionally...
Honda CB1100 CB1000 CB900 CB750 oil filter wrench

Honda CB1100/CB1000/CB900/CB750 Oil Filter Wrench

$14.95 USD
35-9022
Remove and install spin-on oil filters with this 3/8" Drive Tripod Oil Filter Wrench. Designed for our aftermarket spin-on cartridge oil filters.Key Features• 3/8"...
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Honda CB1100 CB1000 CB900 CB750 valve shim kit

Honda CB1100 / CB1000 / CB900 / CB750 Valve Shim Kit

$159.95 USD
73-0172
Service your DOHC CB valves with this 20-Piece Valve Shim Kit with plastic case. 25mm diameter valve shims. Includes 2 of each of the...
Honda CB750 CB900 CB1100 silent cam chain b 412H x 82 14402-438-024

Honda CB750 / CB900 / CB1100 Silent Cam Chain B 412H x 82

$74.95 USD
01-0201
Service your DOHC Honda's valvetrain with this Cam Chain B, 412H x 82 links. A direct replacement for original OEM chains #14402-438-024, #14402-438-025, or...
Honda CB1100 CB1000 CB900 CB750 valve shim 2.90

Honda CB1100 / CB1000 / CB900 / CB750 Valve Shim ~ 2.90

$9.38 USD
17-9290
Dial in your DOHC CB's valve clearances with this Valve Shim, 2.90 size, 25mm diameter.Sold each, order the quantity you need.Key Features• Valve shim•...
Honda CB piston pin 13111-300-000

Honda CB Piston Pin ~ Replaces 13111-300-000

$8.95 USD
05-7200
Replace a worn or damaged piston pin with this Piston Pin, Japanese made to superior quality and replacing OEM Ref. #13111-300-000. Fits the full...
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1980 Honda CB900C Custom · Engine Parts Buying guide

Plan the original Custom’s engine service by assembly

The CB900C has an air-cooled, 16-valve DOHC engine, a five-speed main gearbox and a separate dual-range subtransmission. An oil filter, a valve shim and a piston kit belong to different jobs; diagnose the fault before buying internal parts.

Parts to consider

Honda CB Oil Filter ~ Replaces 15410-426-010 Paper oil filterStock-type paper element; housing O-rings, spring and washer are separate.View part 1980-82 Honda CB900 Piston Kit with Rings ~ Standard Size Standard piston kitOne standard piston with rings, pin and clips; four kits cover all four pistons.View part 1980-82 Honda CB900C / CB900F Athena Gasket Set (Top End Set Only) Athena top-end gasket setHead, base and valve-cover gaskets, four headpipe gaskets, camshaft-holder seal, four sleeve O-rings and additional O-rings.View part

Related parts: Standard piston ring set · 126-link A cam chain · 52-link primary chain

Use measurements before choosing pistons or rings

Low compression can come from valve clearance, valve sealing, valve timing or cylinder wear. Honda calls for bore measurements at several heights and in two directions, plus piston clearance, ring-groove clearance and ring end-gap checks. The standard ring set and complete piston kit each cover one piston; neither corrects a worn or previously enlarged bore.

Keep the Custom’s drive systems distinct

The linked 52-link primary chain is inside the engine. It is separate from the two cam chains, the dual-range subtransmission and the shaft final drive. For head or cylinder removal, Honda calls for engine removal; allow for that access and the disturbed gaskets before buying a piston kit.

Buying questions

Will new rings cure low compression?

Only if inspection shows the rings are the fault and the piston and bore remain serviceable. Check valve clearance and sealing first, then measure the cylinders and ring grooves. Standard rings cannot compensate for excessive bore wear or an oversize piston.

Can the cylinder head and pistons be serviced with the engine installed?

Honda’s CB900C procedure calls for removing the engine for those jobs. Plan lifting support, workspace and the disturbed gaskets before ordering. Routine valve-clearance checking does not require the same strip-down.

What needs checking when the paper oil filter is changed?

Keep the housing spring and support washer in their correct positions, and inspect the cover and center-bolt O-rings plus the drain-plug sealing washer. These are separate from the paper element. A spin-on conversion needs the filter specified for its adapter.

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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