Honda CB750 Nighthawk 1991–1999 Clymer Repair Manual (P/N M436)

Clymer service and repair manual P/N M436 covers the 1991–1993 and 1995–1999 Honda CB750 Nighthawk. The 1994 model year is outside its stated coverage. Its identification table distinguishes 49-state and California entries by year using RC38E engine numbers and RC380/RC381 frame prefixes.

PDF Text Search, Bookmarks and Wiring Detail

Text search and navigation: The repair chapters do not have searchable text. Chapter bookmarks are available, although Contents and Back Cover open the title page and a maintenance-log page. Small labels in the ignition, starting and main wiring diagrams require zooming for comfortable reading.

One printable English PDF with 412 pages, including both covers, front matter, 12 blank pages and two maintenance-log pages.

Engine Overhaul, Carburetor Service and Chassis Repair

The following selected service topics outline the repair coverage. Other sections include storage preparation and body-panel removal.

• Maintenance and testing: Lubrication schedules, tune-up, compression and leakdown testing, oil-pressure checks, cable adjustments, and symptom-based troubleshooting.

• Engine repair: Engine removal, cylinder-head and valve work, camshaft timing, hydraulic-tappet service, piston inspection, and lower-end overhaul.

• Clutch and transmission: Clutch-pack service, external gearshift linkage repair, mainshaft and countershaft inspection, and internal shift-mechanism assembly.

• Fuel and emissions: Carburetor synchronization and overhaul, float-level inspection, vacuum fuel-valve testing, and California evaporative-emission and secondary-air systems.

• Electrical diagnosis: Alternator and regulator/rectifier tests, ignition and starting-system fault isolation, switch-continuity diagrams, connector references, and an all-model wiring diagram.

• Wheels and suspension: Wheels, hubs, tubeless tires, drive chain and sprockets, fork overhaul, steering-head bearings, rear shocks, and swingarm service.

• Brakes: Front disc-brake caliper and master-cylinder service, hose replacement and bleeding, plus rear drum-brake repair.

This manual suits experienced home mechanics and technicians who can use precision measuring tools and electrical test equipment; some operations require specialist equipment or dealer service.

Top-End and Lower-End Repair

Step-by-step procedures cover camshaft removal and timing, cam-chain tensioner service, hydraulic-tappet inspection and bleeding, cylinder-head disassembly, valve and guide work, cylinder-block inspection, pistons and connecting-rod small ends.

The tappet procedure specifies Honda Hydraulic Tappet Bleeder P/N 07973-MJ00000. Using wire to bleed a tappet can damage it, and each tappet must return to its original position.

Lower-end coverage includes oil-cooler, oil-pump, pressure-relief valve and strainer service, crankshaft and alternator-shaft work, connecting rods, bearing-insert selection, and post-rebuild break-in. The in-frame service list and engine-out requirements help plan disassembly; transmission access requires engine removal and crankcase separation.

Clutch Components and Internal Shifting

The clutch material identifies the release mechanism, friction-disc arrangement, judder spring, pressure plate, and clutch outer. Transmission work extends to gears and bushings, shift forks, shift drum and stopper components, through final reassembly.

Named tools include clutch center holder P/N 07HGB-00100A and locknut wrench P/N 07716-0020203. The clutch section warns that loosening the locknut while it is still staked can damage the mainshaft threads.

Carburetor Identification and Emission Systems

The carburetor specifications distinguish VE66B (49-state), VE77C (California), and VE66C (Canada). The floats are nonadjustable; the inspection procedure calls for replacing a float when its level is incorrect.

California sections include carbon-canister service and PAIR control/check-valve work. The U.S. crankcase-breather system is also covered.

Fault Isolation and Electrical References

Symptom-based checks cover hard starting, engine noises, lubrication and tappet faults, clutch and gearshift complaints, carburetion, suspension, steering, and brakes. The electrical chapter adds resistance, voltage and continuity tests for the stator, rotor, pulse generator, ignition coils, starter, relays, switches, lighting, meters, horn and fuses.

Illustrations include an ignition-system schematic, starting-system diagram, horn-switch continuity and connector views, clutch assembly exploded view, California evaporative-emission layout, and the two-page all-model wiring diagram. Rotor-removal instructions name Honda flywheel puller P/N 07933-2160000, with an aftermarket alternative.

Chapter-end tables supply component-specific torque specifications, capacities, recommended lubricants, pressure-test data, wear limits, clearances, bearing-selection data, adjustment specifications and electrical test values.

Chassis Service and Rear-Shock Limits

Chassis procedures extend to hub-bearing replacement, wheel runout and balance checks, steering-bearing preload, and swingarm bearings. Rear-shock spring and mount-bushing replacement are covered, but the sealed damper units cannot be disassembled or rebuilt.

Engine removal, fuel-system work, brake service, and rear-shock spring removal involve heavy parts, flammable gasoline, hazardous brake fluid, and stored spring force. Support the motorcycle securely, use the specified lifting and compression equipment, and follow the manual’s safety warnings before beginning repair work.

Carburetor and Alternator Specification Examples

The carburetor float-level specification is 18.5 mm (0.73 in.), measured from the body surface to the top of the float with the float arm just touching the needle valve.

Alternator charge-coil resistance is listed at 0.4–0.6 ohms and field-coil resistance at 2.1–2.6 ohms. Both specifications apply at 20°C (68°F), with the engine and component cool.