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1981 Honda CB650C Custom Fuel & Carburetor Parts

The 1981 CB650C fuel-system parts have specific checks that should lead the order: M18 × 1.0 tank threads, a four-piece carb holder set and an 89mm-pin condition for the accelerator-pump diaphragm. Identify the tank and carburetors before choosing repair parts across the broader CB650 family.

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Honda motorcycle parts

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

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...
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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 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 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 CB750 CB650 CB450 carb pump diaphragm 16021-393-004

Honda CB750 / CB650 / CB450 Carb Pump Diaphragm ~ Replaces 16021-393-004

$27.95 USD
20-9040
Rebuild your Keihin carb's accelerator pump with this Carb Pump Diaphragm, replacing OEM #16021-393-004 / #16021-393-014 / #16021-MC9-771. Kit contains 1 diaphragm with rod...
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 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 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,...
Honda CB650 CB650C CB650SC carb holder set 16211-460-770

1981-82 Honda CB650 / CB650C / CB650SC Carb Holder Set ~ Replaces 16211-460-770

$77.95 USD
73-0134
Replace your CB650 carb holders with this Carb Holder Set of 4. Replaces those old cracked or dried-up carb holders. Replaces OEM #16211-460-770 (qty...
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 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 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,...
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 CB1100F CB750K CB650 performance main jet kit

1971 / 1981-83 Honda CB1100F / CB750K / CB650 Performance Main Jet Kit

$44.95 USD
48-2114
Tune your 1971 CB750K, CB1100F, or CB650 with this 1971 Performance Main Jet Kit. Includes a total of 16 main jets for Keihin carbs....
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 CB650 CB650C CB650SC stock type air filter 17211-460-000

1980-82 Honda CB650 / CB650C / CB650SC Stock Type Air Filter ~ Replaces 17211-460-000

$17.41 USD
15-0063
Replace your CB650 stock air filter with this Stock-Type Air Filter, replacing OEM #17211-460-000.Key Features• Stock-type air filter• Replaces OEM #17211-460-000• Honda part name:...
Honda CB650 CB650C throttle cable push 17920-425-700

1981-82 Honda CB650 / CB650C Throttle Cable ~ Push ~ Replaces 17920-425-700

$22.26 USD
51-3541
Replace your CB650 throttle push cable with this Throttle Cable "B" Push Type, replacing OEM #17920-425-700.Key Features• Throttle cable "B", push type• Replaces OEM...
Honda CB front fuel tank rubber cushion 17611-KE8-000

Front Fuel Tank Rubber Cushion ~ Replaces Honda OEM 17611-KE8-000

$5.50 USD
27-5520
This aftermarket front fuel tank rubber cushion replaces Honda OEM 17611-KE8-000 on the listed Honda CB-series applications. It mounts to the frame and supports...
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 CB650 CB650C throttle cable pull 17910-426-831

1981-82 Honda CB650 / CB650C Throttle Cable ~ Pull ~ Replaces 17910-426-831

$22.26 USD
51-3540
Replace your CB650 throttle pull cable with this Throttle Cable "A" Pull Type, replacing OEM #17910-426-831.Key Features• Throttle cable "A", pull type• Replaces OEM...
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Honda CB700 CB650 CB550 fuel tank front rubber cushion 17611-KE8-000

Honda CB Genuine Honda 17611-KE8-000 Fuel Tank Front Rubber Cushion ~ Replaces 17611-KE8-000

$17.95 USD
99-5145
This genuine Honda front fuel tank rubber cushion mounts to the frame and supports the front of the gas tank on select classic Honda...
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1981 Honda CB650C Custom · Fuel & Carburetor Parts Buying guide

Use the 1981 fittings and dimensions as the starting point

The petcock, intake holders and pump diaphragm serve different fuel-system locations. Their exact dimensions and supplied contents are more useful than the model name alone when the motorcycle has an altered tank or induction setup.

Parts to consider

1981 Honda CB900 / CB750 / CB650 Fuel Petcock ~ Replaces 16950-MA4-671 1981 M18 petcockM18 × 1.0 tank thread; references 16950-MA4-671 and 16950-461-771.View part 1981-82 Honda CB650 / CB650C / CB650SC Carb Holder Set ~ Replaces 16211-460-770 Four carburetor holdersFour holders replacing reference 16211-460-770. Matching clamps are a separate purchase.View part Honda CB750 / CB650 / CB450 Carb Pump Diaphragm ~ Replaces 16021-393-004 89mm pump diaphragm kitOne diaphragm with rod and one bellows rubber. CB650C application requires an 89mm end-to-end pin.View part

Check the tank connection first

The 1981 petcock is listed with M18 × 1.0 threads, unlike the earlier M16 option. Match the tank actually installed and compare the outlet and clearance. A changed tank can make the motorcycle’s model-year application insufficient for choosing the connection.

Do not skip the pump-pin measurement

The diaphragm kit contains one diaphragm with rod and one bellows rubber. Its CB650C application is conditional on an 89mm end-to-end pin. Measure the old assembly before ordering; a generic Keihin carburetor label does not resolve that requirement.

Fuel & Carburetor Parts questions

Are clamps included with the four carb holders?

The holder set contains four holders. Its notes identify separate 50–52mm band clamps or the specified gear-clamp alternative, with eight clamps required for the described arrangement.

Will the 1981 petcock fit an earlier tank?

Check the actual fitting. This valve uses M18 × 1.0 threads, so a tank with a different connection needs another match regardless of the frame model.

Can I choose the diaphragm without measuring the rod?

No. The written CB650C application requires an 89mm end-to-end pin. Confirm that dimension on the removed component before selecting this pump kit.

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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