1969–1978 Honda CB750, CB750F Factory Shop Manual (P/N 6230010)

• Coverage and document identity: This 276-page PDF set reproduces the 1977 Honda Motor Co., Ltd. factory shop manual in six 46-page files. It covers the base CB750, CB750K1 through K8, CB750F and F1, plus the dedicated F2 ('77) and F3 ('78) supplements. The CB750A Hondamatic is outside this manual's scope.
• Engine removal and internal repair: Covers removal and installation of the engine unit, then separates lubrication, camshaft drive, cylinder head and valve gear, pistons and cylinders, crankshaft and connecting rods, primary drive, and kick-starter work into factory inspection and reassembly sections.
• Clutch, transmission, and carburetor service: Details wet-clutch disassembly and inspection, constant-mesh transmission teardown, gear and shift-mechanism checks, and four-carburetor cleaning, float inspection, adjustment, reassembly, and vacuum synchronization.
• Chassis, wheels, final drive, and brakes: Includes steering-head and front-fork repair, rear shock and rear-fork service, wheel-bearing and rim inspection, tire removal and static balancing, drive-chain work, hydraulic front-brake service and bleeding, rear-brake repair, and F/F2-specific brake arrangements.
• Ignition, charging, starting, and body electrical diagnosis: Provides ignition-timing and spark checks, alternator output testing, regulator and rectifier inspection, starter-motor and starter-clutch service, battery charging procedures, switch and instrument checks, wire-harness connection data, and model-specific wiring diagrams.
• Factory reference material: Supplies special-tool numbers, component-specific torque tables, standard and service-limit data, troubleshooting charts, maintenance schedules, exploded assemblies, section views, test circuits, and adjustment specifications for the covered systems.

Model and Serial Coverage

The manual's initial-frame table identifies the base and K-series builds as CB750 1000001; K1 1055004; K2 2000001; K3 2200001; K4 2341915; K5 2525947; K6 2540001; K7 ('77) 2700002; and K8 ('78) 2800001. F-series starts are CB750F 1000002, F1 2000003, F2 ('77) 2100001, and F3 ('78) 3100002.

The late supplements narrow the application further: K7 starts at engine CB750E-2700001 and frame CB750-2700002; F2 starts at CB750E-2600004 and CB750F-2100001; K8 starts at CB750E-3000001 and CB750K-2800001; and F3 starts at CB750E-2200001 and CB750F-3100002.

The K1-K4 material tracks more than specification changes. It covers the drive-chain oiler and link-type carburetor service, along with cam-chain tensioner, fork, shock, and wheel-hub revisions. It also explains the K3 starter safety unit and clutch switch, three-circuit fuse panel, brake-lining wear indicator, and switchgear changes. Later supplements isolate the K5, K6, K7, K8, and F-series differences in fuel, clutch, breather, suspension, O-ring chain, brakes, air cleaner, connecting rod, and wiring.

Engine and Transmission Systems

The engine chapters map the 736 cc four-stroke OHC inline-four as a complete repair system rather than a collection of tune-up notes. They trace the dry-sump oil path through the separate tank, delivery and scavenge pumps, filter, bypass, relief valve, and leak stopper. Cam timing, cam-chain and tensioner work, cylinder-head inspection, valve guides and seats, piston and cylinder measurement, and crankshaft and connecting-rod bearing selection are handled in their own sections.

Several production breaks are called out where parts identification changes. Crankshaft bearing-mark selection applies from engine CB750E-1015587, while connecting-rod weight identification applies from CB750E-1026594. On K4 engines from CB750E-2352923, the cylinder-head sealing arrangement adds collars and rubber oil seals at specified fastener locations.

The wet multi-plate clutch and five-speed constant-mesh transmission chapters cover disassembly, inspection, reassembly, gear backlash, shaft condition, shift forks, shift drum, positive stopper, final shaft, and gear-position checks. Fuel-system coverage runs from tank and fuel-valve service through carburetor teardown, jet and float-valve inspection, float setting, idle adjustment, and four-gauge synchronization. The K7 supplement adds accelerator-pump and fast-idle checks.

Honda's service-tool listings identify equipment such as piston ring compressor 07954-3000000, AC-generator rotor puller 07933-3000000, clutch lock-nut wrench 07916-2830000, and four-gauge vacuum set 07504-3000100.

Electrical Diagnostics, Maintenance, and Diagram Support

The ignition chapter identifies Toyo Denso ignition coils and the Hitachi contact-breaker assembly. The charging chapter identifies the Hitachi LD113-01 alternator, TL1Z-38 regulator, and SB6B-7 silicon rectifier. It includes the factory charging-test circuit, output and charging-current checks across engine speed, component inspection, and regulator procedures. Starting-motor, starter-clutch, magnetic-switch, battery-condition, normal-charge, and quick-charge sections complete the high-current electrical work. Body-electrical chapters cover the speedometer and tachometer, lighting, flasher relay, horn, handlebar switches, stop-light switches, neutral and oil-pressure switches, and harness connections.

Visual references include the dry-sump lubrication flow diagram, camshaft timing and index views, transmission gear-position drawings, carburetor construction and synchronization views, charging-system test schematic, and model-specific wiring diagrams with the wire-color and connection table.

Separate tune-up and periodic-maintenance groups cover compression testing, spark plugs, ignition timing, tappet and cam-chain adjustment, carburetor synchronization, oil and filter service, and final road testing.

Engine removal, hydraulic brake service, fuel-system work, battery charging, and live charging tests require secure support, ventilation, correct electrical isolation, and eye and hand protection.

Variant-Specific Repair Notes

The K1 supplement flags a front-hub and brake-disc bolt mismatch: using the earlier, longer mounting bolts with the narrower replacement hub can leave the disc plate loose, so the related hub parts must be treated as a matched set. For frames 1044650-2089878, Honda specifies the later double-lip fork seal and deletes the earlier backup ring; mixing the two arrangements or mishandling the seal can cause damage and leakage. The K7 O-ring-chain section warns that steam cleaning, pressure washing, and solvent-bearing chain lubricants can damage the O-rings, and it distinguishes this chain from the earlier joint-tool repair procedure.