1978 Honda CB400A Speedometer & Instruments

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Honda CB750 CB550 CB500 CB450 CB400 speedometer cable 44830-425-870

Honda CB Speedometer Cable ~ Replaces 44830-425-870

$22.66 USD

Replace your CB speedometer cable with this Speedometer Cable in black, replacing OEM #44830-425-870. End-to-end length 38.5". Made in Japan.Key Features• Speedometer cable, black•...

Honda CB1000/CB900/CB750/CB650 Speedo Gear Plug

$43.95 USD

Keep your speedo drive gear clean with this Speedo Gear Plug, 15mm outer diameter, 22mm long.Key Features• Speedo gear plug• 15mm outer diameter, 22mm...

Honda CB custom vintage style mph speedometer front view

Custom Vintage Style Speedometer MPH

$99.95 USD

Custom Vintage Style Speedo (MPH) - Mechanical speedometer ratio: 2240:60. Before ordering, confirm the drive ratio, cable or electrical connection, gauge diameter, and mounting...

Honda CB custom vintage style kph speedometer front view

Custom Vintage Style Speedometer KPH

$99.95 USD

Custom Vintage Style Speedo (KPH) - Mechanical speedometer 60 km/h = 1400 rpm Before ordering, confirm the drive ratio, cable or electrical connection, gauge...

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1978 Honda CB400A · Speedometer & instruments Buying guide

Keep the speedometer and Hondamatic gear display distinct

The cable supports the existing mechanical speedometer system. The alternative gauges require custom mounting and drive checks, and do not replace the Hondamatic’s separate neutral, first- and second-gear indication.

Parts to consider

Black speedometer cableMade in Japan; 38.5 inches end-to-end and replacement reference 44830-425-870. Listed for the 1978 CB400A.View part

Custom mechanical MPH speedometer0–130 MPH, 85 mm diameter and 2240:60 mechanical ratio. Custom mounting is required; verify the drive and connections.View part

Custom mechanical KPH speedometer0–220 KPH, 85 mm diameter and 60 km/h at 1400 rpm calibration. Custom mounting and compatibility checks are required.View part

Service the existing speedometer first

The replacement cable is black, made in Japan and measures 38.5 inches end-to-end. Its application includes the 1978 CB400A. Compare the fitted cable ends and routing, then have the drive and gauge assessed before assuming a cable alone addresses an inaccurate or non-working instrument.

Plan custom gauges around the Hondamatic display

The MPH and KPH gauges have an 85 mm diameter and 57 mm mounting-point spacing, with custom mounting required. Verify the mechanical ratio and illumination connections for the chosen unit. Preserve or separately accommodate the CB400A gear indicator rather than treating a round speedometer as the complete instrument assembly.

Speedometer & instruments buying questions

Did the CB400A originally have a tachometer?

The original Honda instrument layout has a speedometer and a separate N/1/2 gear-position indicator. Choose replacements for those instruments when maintaining the Hondamatic layout, and assess any custom conversion separately.

Is the replacement speedometer cable a confirmed model application?

The 38.5-inch black cable explicitly lists the 1978 CB400A and references 44830-425-870. Compare the actual routing and end fittings if the motorcycle has different instruments, a replacement front wheel or other front-end changes.

Can I choose the custom speedometer by MPH or KPH alone?

Choose the display units, then verify the drive calibration, cable connection, mounting and illumination wiring. Both gauges require custom mounting. The Hondamatic gear-position indicator is a separate part of the original instrument arrangement.

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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