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1981 Honda CB650C Custom Oil & Rear Brake Switches

The oil-pressure switch and rear brake-light switch serve different circuits on a 1981 CB650C. Identify the fault and the relevant mounting point before ordering. A warning light or stop-light problem needs its own diagnosis rather than a replacement chosen from similar-looking electrical fittings.

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Honda CB900 CB750 CB650 CB550 CB500 oil pressure switch 37240-P13-013

Honda CB Oil Pressure Switch ~ Replaces 37240-P13-013

$23.95 USD
73-0825
Replace your oil pressure switch with this Oil Pressure Switch, replacing OEM #37240-P13-013.Key Features• Oil pressure switch• Replaces OEM #37240-P13-013• Honda part name: Switch...
Honda CB1100 CB1000 clutch lever brake light switch 35330-413-003

Honda CB Clutch Lever Brake Light Switch ~ Replaces 35330-413-003

$15.95 USD
29-7029
Replace your front clutch lever safety stop switch with this Clutch Lever Stop Switch, replacing OEM #35330-413-003. This is the switch that allows the...
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Honda CB750 CB650 rear brake light switch 35350-MG7-405

1979-82 Honda CB750 / CB650 Rear Brake Light Switch ~ Replaces 35350-MG7-405

$15.82 USD
27-5523
Restore reliable brake light activation with this Rear Stop Light Switch, designed as a direct replacement for several original Honda rear brake switches. This...
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1981 Honda CB650C Custom · Oil & Rear Brake Switches Buying guide

Match the switch to the circuit being checked

The oil-pressure switch replaces reference 37240-P13-013, while the rear stop-light switch is operated from the brake-pedal system. Confirm the actual component and connectors before selecting either replacement.

Parts to consider

Honda CB Oil Pressure Switch ~ Replaces 37240-P13-013 Oil pressure switchReplacement switch referencing 37240-P13-013 for the listed CB650C application.View part 1979-82 Honda CB750 / CB650 Rear Brake Light Switch ~ Replaces 35350-MG7-405 Rear stop-light switchRear brake-light switch for the CB650C; references 35350-MG7-405 and 35350-425-003.View part

Treat an oil warning seriously

The oil-pressure switch is an electrical component, not proof that the engine’s oil pressure is correct. Use the proper diagnostic procedure to distinguish a switch or wiring fault from an actual lubrication problem before deciding that a replacement switch addresses the warning. If the oil-pressure warning stays on with the engine running, stop the engine and have actual oil pressure checked before riding.

Check rear brake-light operation separately

The rear switch responds to the pedal-operated brake circuit. Compare its mounting and connectors with the fitted parts, then follow the service procedure for adjustment and a function check. A changed pedal or linkage can affect the operating arrangement.

Oil & Rear Brake Switches questions

Does an oil warning prove the switch is defective?

No. Use the correct checks for the warning circuit and the engine’s actual lubrication condition. Do not assume replacing the electrical switch resolves an oil-pressure problem.

Will the rear switch fit modified pedal controls?

Compare the switch mounting and operation with those controls before ordering. The model application supports the listed arrangement but does not verify every custom pedal or linkage.

Which check comes before selecting a replacement?

Identify the circuit and compare the fitted component’s reference and connections. Test the wiring and operation according to the appropriate service information so the order addresses the diagnosed fault.

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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