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1981 Honda CB900C Custom Fuel & Intake Parts

Use the fitted tank and carburetor arrangement to plan fuel-system work on your 1981 CB900C Custom. The year-specific petcock uses M18 × 1.0 threads, carb holders come as four pieces, and the basic sealing kit covers one carburetor. Intake rubbers must be chosen for the correct side.

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Honda CB1100 CB1000 carb fuel connector tube and accelerator tube

Honda CB Carb Fuel Connector Tube and Accelerator Tube O-Rings

$15.26 USD
73-0831
Replace your carb fuel and accelerator tube O-rings with these Carburetor Fuel Connector Tube and Accelerator Tube O-Rings, 12 O-rings.Key Features• Carb fuel connector...
Honda CB1100 CB1000 CB900 CB750 stock type air filter 17211-425-000

Honda CB1100 / CB1000 / CB900 / CB750 Stock Type Air Filter ~ Replaces 17211-425-000

$19.95 USD
15-0069
Replace your DOHC CB's stock air filter with this Stock-Type Air Filter, replacing OEM #17211-425-000. Fits the 1979-82 CB750 family, CB750SC Nighthawk, CB900 family,...
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Honda CB throttle sleeve 53141-300-010

Honda CB Throttle Sleeve ~ Replaces 53141-300-010

$9.95 USD
02-2462
Refresh the throttle feel on your Honda with this Nylon Throttle Sleeve, a replacement for OEM Ref. #53141-300-010 with exceptionally broad fitment across the...
Honda CB1000 CB900 CB750 performance main jet kit

Honda CB1000 / CB900 / CB750 Performance Main Jet Kit

$39.95 USD
48-2111
Tune your CB to match your engine mods with this Performance Main Jet Kit. Includes a total of 16 main jets for Keihin carbs....
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 CB900 CB750 choke cable 17950-425-000

1979-82 Honda CB900 / CB750 Choke Cable ~ Replaces 17950-425-000

$22.66 USD
51-2603
Replace your DOHC CB choke cable with this Choke Cable in black, replacing OEM #17950-425-000. Made in Japan.Key Features• Choke cable, black• Replaces OEM...
Honda CB1100 CB1000 CB900 CB750 float bowl gasket

Honda CB1100/CB1000/CB900/CB750 Float Bowl Gasket

$9.50 USD
20-8031
Replace your DOHC CB float bowl gasket with this Float Bowl Gasket (O-ring). Broad fitment across the 1979-82 CB750 family, CB750SC Nighthawk, CB900/CB1000/CB1100, CB650...
Honda CB1000 CB900 CB750 throttle cable pull 17910-425-020

Honda CB1000 / CB900 / CB750 Throttle Cable ~ Pull ~ Replaces 17910-425-020

$25.95 USD
51-2580
Replace your DOHC CB throttle pull cable with this Throttle Cable "Pull Type", replacing OEM #17910-425-020 / #17910-425-030 / #17910-425-405. Total cable length 47"....
Honda CB900 CB750 carb pump diaphragm 16021-679-005

1979-83 Honda CB900 / CB750 Carb Pump Diaphragm ~ Replaces 16021-679-005

$27.95 USD
20-9042
Rebuild your DOHC CB750's Keihin carb accelerator pump with this Carb Pump Diaphragm, replacing OEM #16021-679-005. Kit contains 1 diaphragm with rod and 1...
Honda CB1000 CB900 CB750 CB650 throttle cable push 17920-425-030

Honda CB1000 / CB900 / CB750 / CB650 Throttle Cable ~ Push ~ Replaces 17920-425-030

$25.95 USD
51-2513
Replace your DOHC CB throttle push cable with this Throttle Cable "Push Type", replacing OEM #17920-425-030.Key Features• Throttle cable, push type• Replaces OEM #17920-425-030•...
Honda CB1000 CB900 CB750 CB700 ultimate performance main jet kit

Honda CB1000 / CB900 / CB750 / CB700 Ultimate Performance Main Jet Kit

$64.95 USD
48-2112
Cover every tuning scenario with this Ultimate Performance Main Jet Kit. Includes a total of 44 main jets for Keihin carbs. Use this jet...
Honda CB1100F CB1000C CB900 carb holder set 16211-438-000

1980-83 Honda CB1100F / CB1000C / CB900 Carb Holder Set ~ Replaces 16211-438-000

$89.95 USD
48-1477
Replace your CB900, CB1000C, or CB1100F carb holders with this Carb Holder Set of 4. Replaces those old cracked or dried-up carb holders. Replaces...
Honda CB1100 CB1000 CB900 CB750 CB700 carb float needle 16155-413-751

Honda CB Carb Float Needle ~ Replaces 16155-413-751

$8.95 USD
48-5011
Replace your DOHC CB float needle (only) with this Float Needle, replacing OEM #16155-413-751.Key Features• Float needle (only)• Replaces OEM #16155-413-751• Honda part name:...
Honda CB1100 CB1000 CB900 CB750 float bowl drain screw o-rings pk 4

Honda CB Float Bowl Drain Screw O-Rings Pk/4

$5.80 USD
48-0792
Replace your float bowl drain screw O-rings with this Float Bowl Drain Screw O-Rings 4-Pack.Key Features• Float bowl drain screw O-rings• 4 per packFitment...
Honda CB1100 CB1000 CB900 carb air box rubber boot set 17251-438-000

1980-83 Honda CB1100 / CB1000 / CB900 Carb Air Box Rubber Boot Set ~ Replaces 17251-438-000

$89.95 USD
73-0139
Replace your CB900, CB1000C, or CB1100F carb-to-air-box boots with this Carburetor to Air Box Rubber Boot Set of 4. Replaces OEM #17251-438-000 (qty 1),...
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 CB650 carb float 16013-413-851

Honda CB Carb Float ~ Replaces 16013-413-851

$27.95 USD
20-6507
Replace your 1980+ DOHC CB carb float with this Carb Float with Pin, replacing OEM #16013-413-851. Broad fitment across the 1980-82 CB750 family, CB750SC...
Honda CB front fuel tank holder rubber 17611-425-000

Honda CB Front Fuel Tank Holder Rubber ~ Replaces 17611-425-000

$7.87 USD
02-6551
Keep your fuel tank snugly mounted at the front with this Front Fuel Tank Holder Rubber, a direct replacement for OEM #17611-425-000. Fits the...
Honda CB1100 CB1000 CB900 CB750 CB550 air screw needle o-ring

Honda CB Air Screw Needle O-Ring

$1.95 USD
48-5043
Replace your air screw needle O-ring with this Air Screw Needle O-Ring, 2.8mm x 1.2mm.Note: sold each, order the quantity you require.Key Features• Air...
Honda CB1000 CB900 CB750 carb rubber passage plugs pk 5 16010-425-671

Honda CB1000 / CB900 / CB750 Carb Rubber Passage Plugs Pk/5 ~ Replaces 16010-425-671

$10.49 USD
48-5001
Replace your float bowl and cover access plugs with this Carb Rubber Passage Plugs Pack of 5. Fits in float bowl and cover access...
Honda CB1100 CB1000 CB900 CB750 float bowl drain screw -a

Honda CB Stock Type Float Bowl Drain Screw ~-A

$6.50 USD
48-5042
Small part, but an important one. This float bowl drain screw with included O-ring allows you to properly drain the carburetor bowl without leaks,...
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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...
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 CB900 CB750 CB650 CB450 CB400 air cut off valve 16048-429-771

Honda CB Air Cut Off Valve ~ Replaces 16048-429-771

$26.95 USD
20-4020
Replace your DOHC CB's carb air cut-off valve with this Carb Air Cut-Off Valve, replacing OEM #16048-429-771 (diaphragm) and #16048-425-771 (spring + 1 O-ring).Key...
Honda CB1100 CB1000 CB900 CB750 float bowl screws pk 2 93892-04016-00

Honda CB Float Bowl Screws Pk/2 ~ Replaces 93892-04016-00

$2.50 USD
48-9031
Replace your float bowl screws with this Float Bowl Screws Pack of 2 (with lock washers), 2 screws and 2 washers per pack. These...
Honda CB1100 CB900 CB750 CB650 carb rebuild kit

Honda CB1100 / CB900 / CB750 / CB650 Carb Rebuild Kit

$24.95 USD
48-1402
Rebuild your 1980-82 DOHC CB750, CB900, CB1100F, or 1981-82 CB650 carb with this Carb Rebuild Kit. Contains float bowl gasket, float needle, and O-rings.Note:...
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Honda CB900 CB750 CB650 press in type pilot jet set size #38 (pk 4)

Honda CB900 / CB750 / CB650 Press In Type Pilot Jet Set ~ Size #38 (Pk/4)

$15.26 USD
73-1002
Refresh your low-speed performance with this Press-In Type Pilot Jet Set of 4 in size #38. Pilot jets handle your idle and low-speed operation...
Honda CB900 CB750 CB650 press in type pilot jet set size #35 (pk 4)

Honda CB900 / CB750 / CB650 Press In Type Pilot Jet Set ~ Size #35 (Pk/4)

$15.82 USD
73-1001
Refresh your low-speed performance with this Press-In Type Pilot Jet Set of 4 in size #35. Pilot jets handle your idle and low-speed operation...
Honda CB1000C CB900C CB900F carburetor rebuild kit

1980-83 Honda CB1000C / CB900C / CB900F Carburetor Rebuild Kit

$32.95 USD
48-1982
Rebuild your CB900 or CB1000C carb with this Carb Rebuild Kit. Contains float bowl gasket, O-rings, float needle, main jets (#68 and #105), pilot...
Honda CB1100 CB1000 CB900 CB750 float bowl drain screw

Honda CB Stock Type Float Bowl Drain Screw

$6.50 USD
48-5042
Replace your stock-type float bowl drain screw with this Float Bowl Drain Screw with O-Ring for the later DOHC and Nighthawk lineup.Note: sold each,...
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Honda CB900 CB750 CB650 press in type pilot jet set size #42 (pk 4)

Honda CB900 / CB750 / CB650 Press In Type Pilot Jet Set ~ Size #42 (Pk/4)

$15.26 USD
73-1003
Refresh your low-speed performance with this Press-In Type Pilot Jet Set of 4 in size #42. Pilot jets handle your idle and low-speed operation...
Honda CB1000 CB900 CB750 round pod air filter black red

Honda CB1000 / CB900 / CB750 Round Pod Air Filter ~ Black/Red

$26.95 USD
15-0021
Fit performance pod filters on your DOHC CB with this 54mm Round Pod Air Filter with black body and red foam filter. Same circular...
Honda CB1100 CB1000 CB900 carb felt throttle and choke shaft seal set 12

Honda CB Carburetor Felt Throttle & Choke Shaft Seal Set/12

$32.95 USD
33-0044
Replace worn or missing felt throttle and choke shaft seals during carburetor service on compatible vintage Honda CB models. These felt seals are used...
Honda CB750C CB900C fuel tank emblem screw set

Honda CB750C / CB900C Fuel Tank Emblem Screw Set

$3.50 USD
01-0123
Secure your fuel tank emblems with this Fuel Tank Emblem Screw Set of 4, replacing OEM #93500-04006-0G. Set includes four screws, enough to mount...
Honda CB1000 CB900 CB750 round pod air filter

Honda CB1000 / CB900 / CB750 Round Pod Air Filter

$19.95 USD
15-0037
54mm round pods with a chrome end cap to your DOHC CB with this 54mm Round Pod Air Filter. Same circular style as the...
Honda CB1100 CB1000 CB900 CB750 CB650 carburetor cap screw set 8

Honda CB Carburetor Cap Screw Set/8

$5.80 USD
73-0100
Refresh your DOHC carb cap screws with this Carburetor Cap Screw Set of 8 with metal washers.Key Features• Carburetor cap screw set, 8 pieces•...
Honda CB 54mm black round pod air filter

54mm Round Pod Air Filter with Black End Cap

$24.95 USD
15-0169
Replace worn, damaged or restrictive clamp-on filters with this aftermarket 54mm round pod air filter. The black end cap gives the filter a darker...
Honda CB1100 CB1000 Keihin pd carb felt throttle shaft seal set 6

Honda CB Keihin PD Carburetor Felt Throttle Shaft Seal Set/6

$18.95 USD
33-0043
Replace worn or missing felt throttle shaft seals on Keihin PD carburetors. These felt seals are used during carburetor service or restoration to help...
Honda CB900 CB750 CB650 air cut off valve with cover 16048-429-771

Honda CB Air Cut Off Valve With Cover ~ Replaces 16048-429-771

$34.95 USD
48-9029
Replace your carb air cut-off valve with this Carb Air Cut-Off Valve with Cover. Replaces OEM #16048-429-771 (diaphragm), #16048-425-771 (spring + 1 O-ring), and...
Honda CB1100F CB1000C CB900C CB900F oval pod air filter

Honda CB1100 / CB1000 / CB900 Oval Pod Air Filter

$24.95 USD
15-0035
Fit larger oval pods to your DOHC CB with this 54mm Tapered Oval Pod Filter with chrome end cap. Sized for 1980-84 stock Mikuni...
Honda CB1000C CB900C CB900F deluxe carburetor rebuild kit for 1980-1983 applications

83 Honda CB1000C / 80-82 CB900C / 81-82 CB900F Deluxe Carburetor Rebuild Kit

$34.95 USD
48-0831
This deluxe aftermarket carburetor rebuild kit provides a high-content selection of sealing, fuel-control, jetting, and mixture-adjustment components for servicing one original carburetor on the...
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1981 Honda CB900C Custom · Fuel & Intake Parts Buying guide

Include the 1981 fuel-line diaphragm in the diagnosis

Honda’s 1981 Custom supplement adds a vacuum-operated fuel-line diaphragm between the tank supply and carburetors. Its fuel, vacuum and vent connections matter when fuel does not reach the bowls. The manual tank petcock, intake holders and one-carb sealing kit serve different parts of that system.

Parts to consider

1981 Honda CB900 / CB750 / CB650 Fuel Petcock ~ Replaces 16950-MA4-671 M18 × 1.0 petcock1981 Custom application; references 16950-MA4-671 and 16950-461-771. Verify the tank thread.View part 1980-83 Honda CB1100F / CB1000C / CB900 Carb Holder Set ~ Replaces 16211-438-000 Four carb holdersFour engine-side holders; required clamp sizes are 46–49mm and 50–52mm, four of each when replacing all clamps.View part Honda CB1100 / CB900 / CB750 / CB650 Carb Rebuild Kit One-carb sealing kitFloat-bowl gasket, float needle and O-rings; each kit rebuilds one carburetor.View part

Related parts: Four carb-to-airbox boots · Stock-airbox filter

The manual petcock is only part of the fuel path

The featured petcock has an M18 × 1.0 tank connection. Honda’s 1981 diaphragm check also verifies that fuel is shut off without vacuum and flows when the specified test vacuum is applied. Use the workshop test and correct tube routing before replacing carburetor parts; confirm the exact valve version before choosing any repair kit.

Keep the original intake connections working together

Engine-side holders and the larger airbox-side boots are separate four-piece sets with different clamp requirements. Check that the bank is seated evenly and the airbox remains intact. Honda’s troubleshooting includes intake leaks and a dirty air cleaner, so correct these faults before trying to tune around them.

Buying questions

Why might the bowls remain dry with the tank petcock on?

On the 1981 Custom, check the separate fuel-line diaphragm and its vacuum and vent tubes as well as the tank strainer and fuel line. A blockage or failed automatic valve can restrict supply even when the manual petcock is open. Follow Honda’s diaphragm test before condemning the carburetors.

Will a basic rebuild kit fix every fuel leak?

No. Its gasket, float needle and O-rings cover only their specified positions. Trace the leak and inspect the mating seat, bowl, drain screw and connecting tubes; a damaged hard part may need a separate repair.

Can the same rubber set repair both sides of the carburetor bank?

No. Holders connect the carburetors to the engine, while the other boots connect them to the airbox. Match the side and position, then check the separate clamps and confirm that previous intake modifications have not changed the arrangement.

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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