Honda CB750 Nighthawk Service & Repair Manual, 1991–1999 (P/N 61MW307)

This Honda model-specific service manual covers the carbureted CB750 Nighthawk for 1991-1993 and 1995-1999. It addresses the air-cooled inline-four, hydraulic-tappet valve train, four constant-vacuum carburetors, five-speed transmission, front hydraulic disc brake, and rear drum brake used in the covered U.S. and Canadian configurations. Honda states that the book is written for readers with basic maintenance knowledge of Honda motorcycles; because standard workshop procedures are abbreviated, it is best suited to experienced owners and technicians who can also consult the Honda Common Service Manual.

• Coverage and document identity: 1991-1993 and 1995-1999 CB750 Nighthawk, Honda item/part number 61MW307, supplied as a 198-page PDF in a 30.68 MB RAR archive. The manual identifies A (America), AC (California), and CM (Canada) types.
• Engine repair coverage includes engine removal and installation, camshaft timing, cylinder-head disassembly, cylinder and piston service, hydraulic-tappet inspection and bleeding, oil-pump service, oil-pressure checks, and oil-cooler removal.
• Fuel-system procedures cover carburetor-rack removal and separation, vacuum- and float-chamber overhaul, carburetor recombination and synchronization, the U.S.-only idle-drop pilot-screw procedure, high-altitude adjustment, and California emissions plumbing.
• Drivetrain work runs from in-frame clutch and gearshift-linkage repair through crankcase separation, transmission disassembly, shift-fork and shift-drum service, crankshaft and connecting-rod bearing selection, and alternator-shaft overhaul.
• Chassis sections detail wheel service, fork disassembly and seal installation, steering-stem bearings, rear-shock spring removal, swingarm pivot bearings, front master-cylinder and caliper repair, and rear brake-panel service.
• Electrical diagnosis is divided among the charging, transistorized ignition, starter/interlock, and lighting/meter/switch systems, supported by fault-isolation flowcharts, system-location views, continuity tables, and a full wiring diagram.

Model and Market Identification

The year coverage follows the factory cover exactly: 1991-1993 and 1995-1999. The 1994 model year is not listed. Applicability is organized by market type rather than by a serial-range table. The identification pages show where to find the frame serial number, engine serial number, VIN, color-code label, and carburetor identification number. Fuel specifications distinguish the VE66B carburetors used on A models, VE77C on California AC models, and VE66C on Canadian CM models.

Engine and Drivetrain Repair Depth

The manual separates jobs that can be completed with the engine in the frame from work that requires engine removal. The oil pump, cylinder head/cylinder/piston group, clutch and shift linkage, and alternator are serviceable in-frame. Transmission, shift-fork, shift-drum, crankshaft, connecting-rod, and starter-clutch work requires the engine to come out; the internal sections then cover crankcase separation, transmission assembly, color-coded bearing selection, and final crankcase assembly.

Reference material includes general and component-specific torque tables, fluid capacities, oil-pressure test data, wear limits, clearances, carburetor settings, and electrical test specifications. The special-tool list identifies the pilot-screw wrench 07908-4730001, hydraulic-tappet bleeder 07973-MJ00000, shock-absorber compressor 07GME-0010000, and flywheel puller 07933-2160000, along with valve, bearing, steering, and fork service tools.

Two repair cautions show the level of model-specific detail. Crankshaft bearing inserts must return to their original locations; a misplaced insert can block an oil feed and lead to engine seizure. Carburetor diaphragms must be removed before compressed-air cleaning because the blast can damage them.

Chassis, Brakes, and Electrical Diagnosis

Front suspension coverage reaches fork teardown and assembly, while the rear section covers shock spring removal and swingarm bearing replacement. The brake chapter handles front pad, master-cylinder, and caliper repair plus rear drum-panel and pedal-linkage service. Brake-fluid replacement and air bleeding are referred to the Honda Common Service Manual rather than reproduced here.

Named visual references include the Lubrication System Diagram, Cable & Harness Routing views, the California Pulse Secondary Air Supply System and Evaporative Emission Control System diagrams, charging and ignition System Location views, and the full Wiring Diagram with switch-continuity tables. The electrical flowcharts isolate charging faults among the battery, regulator/rectifier, and alternator; ignition diagnosis covers the ignition control module (ICM), coils, pulse generator, and side-stand/neutral interlock. The transistorized ignition timing is inspected, but it is not adjustable.

This is not intended to replace Honda's Common Service Manual. Tubeless-tire work, wheel-bearing replacement, brake bleeding, battery testing and charging, and several general switch tests are cross-referenced to that companion publication. Secure the motorcycle with a stable jack or hoist before engine, wheel, fork, shock, or swingarm repair, and follow the manual's fuel, brake dust, battery, and electrical-isolation precautions.