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1981 Honda CB900C Custom Electrical Service Parts

Identify the circuit and installed components before choosing electrical parts for your 1981 CB900C Custom. The main loom uses the 1981–82 Custom reference, smaller connecting harnesses remain separate, and a coil or regulator needs its own contents and connector checks. Shared model filtering does not make every option interchangeable.

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Honda CB1100 CB1000 rick's electrics brand ignition coil 30500-422-003

Honda CB Rick's Electrics Brand ~ Ignition Coil ~ Replaces 30500-422-003

$119.95 USD
24-6011
Replace your DOHC CB ignition coil with this Rick's Electric Replacement Ignition Coil, replacing OEM #30500-422-003 / #30500-422-013. Comes with wires attached.Two coils used...
Honda CB1100 CB1000 CB900 CB750 starter motor 31200-438-505

Honda CB1100 / CB1000 / CB900 / CB750 Starter Motor ~ Replaces 31200-438-505

$329.00 USD
73-1079
Replace your starter motor with this Starter Motor Unit, replacing OEM #31200-438-505. This starter bolts on as a direct replacement for the OEM type...
Honda CB900C wire harness 32100-461-770

1981-82 Honda CB900C Wire Harness ~ Replaces 32100-461-770

$109.95 USD
73-0129
Replace your CB900C Custom main harness with this Main Wire Harness Loom, replacing OEM #32100-461-770.Note: this fits the model year and type listed. Other...
Honda CB750 DOHC CB900 CB1100 dynatek dyna 2000 ultimate kit

1979-83 Honda CB750 DOHC / CB900 Dynatek Dyna 2000 Ultimate Kit

$999.00 USD
07-9989
Go all-in on the DOHC CB750, CB900, or CB1100 with this Dyna 2000 Digital Performance CDI Ignition Ultimate Kit. Includes the Dyna 2000 ignition...
Honda CB900C air sensor sub wire with rubber 32111-463-000

1980-82 Honda CB900C Air Sensor Sub Wire With Rubber ~ Replaces 32111-463-000

$14.95 USD
73-0908
Replace your air sensor sub wire with this Air Sensor Sub Wire with Rubber Cover, the wire that connects to and covers the air...
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Honda CB1000C CB900C rear brake light switch spring 35357-MA2-610

1980-83 Honda CB1000C / CB900C Rear Brake Light Switch Spring ~ Replaces 35357-MA2-610

$8.19 $7.87 USD
You save $0.32
73-0849
Replace your rear brake stop switch spring with this Rear Brake Light Stop Switch Spring. This is the spring that attaches to the rear...
Honda CB1100 CB900 CB750 performance high output 3.3 ohm coil

Honda CB1100 / CB900 / CB750 Performance High Output 3.3 Ohm Coil

$119.95 USD
17-6810
Upgrade your CB750 or big-bore DOHC CB with this Performance Dual Output Ignition Coil, a 3.3 Ohm dual-tower type with hardware. Replaces stock factory...
Honda CB750 DOHC CB900 dynatek dyna 2000 ignition system

1979-83 Honda CB750 DOHC / CB900 Dynatek Dyna 2000 Ignition System

$795.00 USD
07-9991
Get just the digital ignition module for your DOHC CB with this Dyna 2000 Digital Performance CDI Ignition. No coils, no wires, just the...
Honda CB1100 CB900 CB750 coil high tension wire ends (pk 2)

Honda CB1100 / CB900 / CB750 Coil High Tension Wire Ends (Pk/2)

$3.50 USD
17-6831
Replace the high-tension wire ends that fit inside your coil towers with this 2-pack of Coil High-Tension Lead Ends. Same fitment as our tower...
Honda CB750 CB900 CB1100 performance 5.2 ohm ignition coil

Honda CB Performance 5.2 Ohm Dual-Output Ignition Coil

$129.95 USD
07-9973
Step up your ignition with this Performance High Output 5.2 Ohm Dual-Output Ignition Coil. Primary resistance of 5.2 Ohm, secondary of 17K Ohm, designed...
New
Honda CB900C stop switch assembly 35350-166-005

1980-82 Honda CB900C Stop Switch Assembly ~ Replaces 35350-166-005

$17.57 USD
07-4621
Replace a worn brake stop switch with this Stop Switch Assembly, complete with spring. A direct replacement for OEM #35350-166-005, fitting the CB900C Custom.Key...
Honda CB900C CB900F NGK DR9EIX spark plug

1980-81 Honda CB900C / CB900F NGK DR9EIX Spark Plug

$22.95 USD
50-8606
Replace your spark plugs with these NGK DR9EIX Spark Plugs.Key Features• NGK DR9EIX spark plugFitment / Compatibility• Honda CB900C (1980‑81) Custom• CB900F (1981) SupersportPart...
Honda CB750 DOHC CB900 CB1100 dynatek dyna 2000 premium kit

1979-83 Honda CB750 DOHC / CB900 Dynatek Dyna 2000 Premium Kit

$899.00 USD
07-9990
Upgrade your DOHC CB with the digital Dyna 2000 ignition in a middle-tier kit configuration. This Dyna 2000 Digital Performance CDI Ignition Premium Kit...
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1981 Honda CB900C Custom · Electrical Service Parts Buying guide

Trace the fault before replacing electrical parts

Separate a no-crank fault, a cranking engine with no spark, a charging problem and a warning-light fault. They share wiring and a battery, but they do not necessarily need the same replacement part.

Parts to consider

1981-82 Honda CB900C Wire Harness ~ Replaces 32100-461-770 1981–82 Custom main loomMain harness for this Custom application, reference 32100-461-770; other model years can differ.View part Honda CB Rick's Electrics Brand ~ Ignition Coil ~ Replaces 30500-422-003 Replacement ignition coil with wiresRick’s coil replaces references 30500-422-003 and 30500-422-013 and comes with wires attached. Two coils are used per motorcycle.View part Honda CB1100 / CB1000 / CB900 / CB750 Rectifier/Regulator Eight-wire replacement rectifier/regulatorRick’s unit with two plugs: four positions carrying three wires and six positions carrying five wires. Match both connections before ordering.View part

Related parts: Coil connecting harness A · Horn connecting harness B

Choose the correct loom and branch

The 1981 Custom main-harness reference is 32100-461-770. Identify damaged wiring before choosing a complete loom or a short sub-harness. The ignition-coil connecting harness is a separate item; do not assume every branch lead comes with the main loom.

Keep component diagnosis specific

The original ignition is transistorized, with two coils serving cylinder pairs. Check the ignition supply, leads and connectors before condemning a coil or spark unit. For charging faults, test the battery, wiring and alternator before replacing the regulator.

Practical questions

Will a new harness solve every intermittent electrical fault?

A loom helps when its wiring or connectors are damaged. Loose battery cables, poor grounds, failing switches and faulty components can cause similar symptoms, so trace the affected circuit before replacing the whole harness.

What should I check if the starter turns but the engine will not fire?

Separate ignition from fuel or engine faults. Check for spark using the service procedure, then inspect the ignition power supply, coil connections, plug leads and plugs. A starter relay replacement will not by itself restore missing spark.

Why does a replacement battery keep going flat?

Check charging performance and wiring connections, then look for an unintended drain while parked. A new battery can temporarily mask a charging or wiring fault without correcting it.

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

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