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1973 Honda CB500K Starter Service & Charging Equipment

Starter service and charging repairs require different components on a 1973 Honda CB500K. The motor’s brushes, external relay and charging regulator have separate functions. Compare the fitted starter and battery equipment before ordering, and inspect protective terminal covers alongside the working electrical components.

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Currently viewing Starter & Charging System

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Honda CB750 CB550 CB500 CB350 starter solenoid relay 35850-371-670

Honda CB Starter Solenoid Relay ~ Replaces 35850-371-670

$21.46 USD
09-6582
Replace a failing starter solenoid with this Starter Solenoid Relay, replacing OEM #35850-371-670 / #35850-306-670 / #35850-HA7-670. Fits the SOHC CB750 lineup plus CB500/CB550K,...
Honda CB1100 CB1000 starter motor terminal rubber boot 32411-230-000

Honda CB Starter Motor Terminal Rubber Boot ~ Replaces 32411-230-000

$4.61 USD
73-0092
Replace your starter motor terminal cover with this Starter Motor Terminal (Cover) Rubber Boot, replacing OEM #32411-230-000.Key Features• Starter motor terminal rubber boot• Replaces...
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Honda CB750 CB550 CB500 CB400 CB350 rectifier regulator

Honda CB Rectifier/Regulator

$199.95 USD
24-2109
Replace your SOHC CB regulator and rectifier with this Rick's Electric OEM-Style Rectifier/Regulator. Combination unit replaces the OEM regulator and rectifier; stock-type plugs and...
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Honda CB750 CB550 rectifier regulator lithium ion battery compatible

Honda CB Rectifier/Regulator ~ Lithium Ion Battery Compatible

$199.95 USD
24-2011
Upgrade to a lithium-ion compatible charging regulator with this Rick's Electric Rectifier/Regulator. Designed with a lower voltage set point to work exclusively with lithium-ion...
New
Honda CB starter motor seal 60 x 1.4 31206-286-158

Honda CB Starter Motor Seal 60 x 1.4 ~ Replaces 31206-286-158

$5.95 USD
03-0784
Seal up your starter motor with this Starter Motor Seal, size 60 x 1.4, replacing OEM #31206-286-158 / #31206-402-008. Exceptionally broad fitment across the...
New
Honda CB starter motor seal 24.4 x 3.1 91312-MG7-003

Honda CB Starter Motor Seal 24.4 x 3.1 ~ Replaces 91312-MG7-003

$4.50 USD
03-0780
Seal up your starter motor with this Starter Motor Seal, size 24.4 x 3.1, replacing OEM #91312-MG7-003 / #91309-300-000 / #91309-425-003. Exceptionally wide fitment...
Honda CB1100 CB1000 CB900 CB750 starter motor brush set 31201-292-158

Honda CB Starter Motor Brush Set ~ Replaces 31201-292-158

$29.95 USD
24-2021
Replace your Mitsuba 2-brush starter motor brushes with this Replacement Starter Brush Set of 2, 12mm x 14mm x 6mm, 1 piece with insulated...
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Honda CB550F CB550K CB500K alternator cover gasket 11691-323-306

1971-78 Honda CB550F / CB550K / CB500K Alternator Cover Gasket ~ Replaces 11691-323-306

$9.86 USD
18-6999
Replace your CB500K or CB550 alternator cover gasket with this Alternator Cover Gasket, replacing OEM #11691-323-306.Key Features• Alternator cover gasket• Replaces OEM #11691-323-306• Honda...
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1973 Honda CB500K · Starter & Charging Buying guide

Distinguish starter internals from relay and charging work

The brush set serves Mitsuba two-brush motors; the relay is external starting equipment. A terminal boot protects the cable connection. Combined rectifier/regulators are separate charging choices, with dimensions and battery compatibility that need to be checked.

Parts to consider

Honda CB Starter Motor Brush Set ~ Replaces 31201-292-158 Brush pair for a Mitsuba two-brush motorIncludes two brushes measuring 12 x 14 x 6 mm. One has insulated leads and the other non-insulated leads; confirm the installed starter type.View part Honda CB Starter Solenoid Relay ~ Replaces 35850-371-670 Relay for the starting circuitReferences Honda 35850-371-670, 35850-306-670 and 35850-HA7-670. It is external relay equipment rather than a brush or complete starter motor.View part Honda CB Starter Motor Terminal Rubber Boot ~ Replaces 32411-230-000 Protective starter-terminal coverOne rubber boot references Honda 32411-230-000. The starter, cable and terminal nut are excluded from this cover-only purchase.View part

Related parts: Regular combined charging unit · Lithium-ion-only charging alternative

Inspect the motor construction before internal service

The starter brush listing specifies both dimensions and the Mitsuba two-brush design. Compare those features with the motor fitted to the bike, not merely the motorcycle model. A new relay cannot replace worn brushes, and a brush pair does not supply a cable or protective terminal boot.

Read battery compatibility before comparing regulator bodies

The regular combined regulator is listed with 68 x 94 x 26 mm dimensions and 80 mm hole centres, with custom mounting possible. The lithium-specific alternative is not for standard lead-acid batteries. Check the battery’s required charging specification and each unit’s space requirements before choosing a charging replacement.

Starter & Charging FAQs

What does the brush set supply for the starter?

Two 12 x 14 x 6 mm brushes are supplied for the listed Mitsuba two-brush starter, with one insulated-lead and one non-insulated-lead piece. Confirm the motor construction before ordering; the package is not a complete starter assembly.

Which Honda references should I compare for a starter-relay replacement?

The relay cross-references Honda 35850-371-670, 35850-306-670 and 35850-HA7-670. Compare the fitted relay and connection arrangement with those references when selecting the external starting component, particularly if the motorcycle’s wiring or starter equipment has already been changed.

What battery requirement separates the lithium regulator from other choices?

The lithium unit requires a compatible lithium-ion battery and specifies a 14.0 V ±0.2 charging set point. It excludes standard lead-acid batteries. Match that stated requirement to the battery manufacturer’s specification before selecting it for your installed battery.

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