A 1977 CB750K wiring repair calls for the correct late-model components, especially the main loom and handlebar controls. Browse circuit parts, lighting and ignition equipment here, then check the year application and connections against what is actually fitted to your motorcycle.
Replace your CB750 spark plugs with these NGK D8EA Spark Plugs, the standard original CB750 spark plug.4 required per CB750.Key Features• NGK D8EA spark...
Upgrade or restore your classic Honda motorcycle’s battery mounting system with this Stock Type Battery Band — a quality replacement designed to keep your...
Replace your SOHC CB750's points condenser with this Condenser, replacing OEM #30250-300-154 / #30250-300-005. Two required per CB750.Key Features• Condenser• Replaces OEM #30250-300-154 /...
Match with the left-side contact point using this Contact Point Set (1 piece, left-hand side) for cylinders 1 & 4. Replacing OEM #30203-300-005. Same...
Replace your turn signal flasher relay with this Turn Signal (Flasher) Relay, 12V/23W, 3-prong, with rubber mount attached. For the series 2 and later...
Replace your alternator stator wire harness with this Alternator Stator Wire Harness. Same 7-wire plug as the OEM part and hooks up without alterations....
Replace your points cover screws with this Points Cover Screws Set of 2.Key Features• Points cover screws• Set of 2Fitment / Compatibility• All 1969‑1978...
Restore a late-'70s or DOHC-era CB's ignition with this Ignition Switch with fork lock and keys, replacing OEM #35010-377-007 / #35100-377-003/007 / #35100-422-017 /...
Replace your rear brake light switch with this Rear Brake Light Stop Switch. Exceptionally broad fitment across the SOHC CB750 lineup and virtually the...
Replace your CB750 ignition coils with this Stock Type Ignition Coil Set of 2 with brackets, replacing OEM #30500-300-013. Dual coil assembly pre-mounted on...
Replace your fuse box with this Complete Fuse Box Assembly, including 3 extra fuses. Replaces OEM #32110-341-702. Fits the 1973-78 CB750K, 1977-78 CB750F Supersport,...
Replace your oil pressure switch wire with this Oil Pressure Switch Wire Assembly, including the wire and rubber cover. Replaces OEM #31270-300-154 / #31270-300-005.Key...
Keep your vintage Honda starting strong with this ATX14AHL Replacement Battery, designed for reliable performance across a wide range of classic Honda models. This...
Fit the front brake / clutch safety switch on your classic Honda with this Front Brake & Clutch Safe-T-Switch, replacing OEM #35340-329-003. Used on...
Restore your mid-'70s Honda's stock reflectors with this Stock-Type Screw-On Reflector with a 6mm thread, replacing OEM #33741-340-670. Broad fitment covering the 1972-78 CB750...
Replace your battery box rubber with this Battery Box Rubber "B", replacing OEM #50327-300-000.Sold each, order the quantity you require.Quantity used per bike:• CB750K...
Rebuild your Honda ignition switch base with this Switch Repair Kit, including the base cover. Designed for use with our #12-0051 ignition switch (sold...
Replace the gasket on your 1972-onward Honda's tail light lens with this Tail Light Lens Gasket, replacing OEM #33709-341-671. Matches the fitment of our...
Pull your SOHC CB750 alternator rotor with this Alternator Rotor Puller, 20mm x M1.5 right-hand thread, for internal-thread rotors.Key Features• Alternator rotor puller• 20mm...
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...
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...
Replace your SOHC CB750 ignition coil with this Stock-Type Ignition Coil for contact point ignitions, replacing OEM #30501-300-003 / #30502-300-003 / #30502-300-013. 100mm center-to-center...
Restore headlight mounting with this Headlight Setting Collar, replacing OEM #61304-292-000. Exceptionally broad fitment across the classic Honda lineup, from the SOHC and DOHC...
Replace a damaged or pitted headlamp rim with this Chrome Headlamp Rim, replacing OEM #33101-300-673 / #33101-405-671. Fits all 1969-78 CB750s, select late-model DOHC...
Restore your headlamp trim with this Headlamp Rim & Retainer Assembly, replacing OEM #33101-404-671 / #33121-300-672 / #33153-300-671. Fits the full 1969-78 SOHC CB750...
Replace your wire harness with this Main Wire Harness Loom, replacing OEM #32100-405-670.These fit only the model year and type listed. Other years and...
Replace your late-'70s CB starter solenoid with this Starter Solenoid Relay, replacing OEM #35850-375-000 / #35850-286-027. Broad fitment across the late SOHC CB750, CB500T/CB550...
Ensure proper gear position signaling with this Honda OEM neutral switch, designed as a direct replacement for the original component. This switch helps accurately...
The 1977 main loom, late fuse box and right-hand control offer three different starting points. Identify the damaged assembly first, then check which small wires, seals or mounting pieces can be reused.
A main harness, fuse box and handlebar switch do different jobs. Diagnose the affected circuit with the appropriate service manual before replacing an assembly. Compare connectors and existing components so a local fault does not lead to an unnecessary order for an entire loom.
Check changes made by previous owners
Electronic ignitions, custom headlights and relocated horns may need different connections or mounts from stock equipment. Read the individual application and installation requirements. A component appearing in this electrical selection does not establish compatibility with every modification already fitted to a 1977 motorcycle.
Questions about electrical
Is the main wiring harness shared with every SOHC CB750?
The main loom shown here is specifically listed for the 1977 CB750K. Its description warns that other years and types use different references. Confirm the motorcycle’s model and the loom application before choosing a replacement.
Do both handlebar switches route their wires the same way?
No. The listed 1977–78 right-hand assembly routes wiring outside the handlebar. The matching-year left-hand assembly requires internal wire routing and has a locator pin. Check each side against your handlebars rather than treating them as an identical installation.
Should I replace every electrical part while restoring the bike?
Build the order around diagnosed faults and damaged components. Some listings supply complete assemblies; others are individual wires, contact points or mounting pieces. Check what your chosen assembly includes before buying additional parts that may already be supplied.
Not sure which part you need?
Send your model and year, plus photos of your existing part and any changes to the original setup.