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1985 Honda CB450SC Nighthawk Charging and Starter Order Checks

Identify the precise charging or starter service needed on your 1985 CB450SC Nighthawk before ordering. The available regulators differ in wiring and battery requirements, while the starter seals serve different locations. Use the fitted connectors and original seal references to narrow the replacement choice.

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Currently viewing Starter & Charging System

Honda motorcycle parts

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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...
Honda CB1100 CB1000 CB900 CB750 starter clutch diode 31700-124-003

Honda CB Starter Clutch Diode ~ Replaces 31700-124-003

$12.88 USD
24-2044
Replace your starter clutch diode with this Stator Clutch Diode/Rectifier, replacing OEM #31700-124-003 / #31700-166-008. Exceptionally broad fitment across the SOHC and DOHC CB750...
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 CB450 CB400 rectifier regulator 31600-KV8-681

1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Replaces 31600-KV8-681

$179.95 USD
24-2088
Replace your CB400 or CB450 rectifier/regulator with this Rectifier/Regulator, 6 wires, 3 yellow in one connector block and 3 wires in a 4-space block....
New
Honda CB450 CB400 rectifier regulator lithium ion battery compatible 31600-KV8-681

1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Lithium Ion Battery Compatible

$189.95 USD
24-2034
Upgrade your CB400 or CB450 to a lithium-ion compatible regulator with this Rick's Electric Rectifier/Regulator, replacing OEM #31600-KV8-681 / #31600-413-008. Designed with a lower...
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1985 Honda CB450SC Nighthawk · Starter & Charging System Buying guide

Separate regulator compatibility from the starter’s sealing needs

The six-wire regulator describes two connector blocks. The lithium alternative has a specific battery requirement and voltage set point. For starter work, compare the small installation seal with the distinct large body seal before choosing the service parts.

Parts to consider

1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Replaces 31600-KV8-681 Two-block charging unitSix wires are specified: three yellow in one block and three wires in a four-space block. The listed Honda references include 31600-KV8-681, 31600-413-008 and 31600-MC9-740.View part 1978-86 Honda CB450 / CB400 Rectifier / Regulator ~ Lithium Ion Battery Compatible Lithium-only charging optionThe Rick’s unit specifies a 14.0V ±0.2 set point and no black sensing lead. Confirm suitability with the lithium battery; it is not for standard lead-acid batteries.View part Honda CB Starter Motor Seal 24.4 x 3.1 ~ Replaces 91312-MG7-003 Small starter installation sealOne 24.4 x 3.1mm seal is supplied for one compatible starter installation. Match 91312-MG7-003, 91309-300-000 or 91309-425-003 against the required seal.View part

Related parts: Large starter body seal · Starter terminal protective boot · Starter-interlock diode

Compare the named wires without inventing a connector pinout

A four-space block with three wires does not imply four occupied positions. Compare the actual connector blocks and wire colors with the six-wire unit’s description. The lithium alternative omits the black sensing lead and requires its own battery compatibility check; no wiring conversion procedure is supplied here.

Identify the starter component by its reference and service location

The 60 x 1.4mm body seal differs from the 24.4 x 3.1mm installation seal. The terminal boot covers the cable connection, and the starter-interlock diode serves the safety circuit. Match the original reference and required location instead of buying several starter-labeled parts as an assumed repair kit.

Charging & Starter Part Match FAQs

What should I compare if my charging connector has an empty fourth space?

Compare both connector blocks, wire colors and the original Honda reference. The replacement has six wires: three yellow in one block and three in a four-space block. Match the fitted arrangement without assuming every connector space must contain a lead.

What distinguishes the lithium regulator when planning the charging order?

It is lithium-ion only, with a 14.0V ±0.2 set point, and its design has no black sensing lead. Confirm the battery’s requirements and connector arrangement before choosing it. The listing specifically excludes standard lead-acid battery use.

How do I decide between the two listed starter seal sizes?

Use the seal location and Honda reference. The 60 x 1.4mm item seals the starter body or cover. The smaller 24.4 x 3.1mm item lists 91312-MG7-003, 91309-300-000 and 91309-425-003. Check the motorcycle’s parts fiche before selecting the needed seal.

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