Segment:
Sportbike / Universal Japanese Motorcycle (UJM)
Target Audience:
Enthusiasts seeking to maintain, restore, or extensively repair their 1976 Suzuki GS750.
Competitors 1976:
Kawasaki Z900, Honda CB750, Yamaha XS750.
Distinguishing Features:
The GS750 was Suzuki's first truly competitive four-cylinder motorcycle in the 750cc class, known for its smooth engine and agile handling, distinguishing it from some of its more powerful but less refined competitors.
Vehicle Highlights:
Smooth inline-four engine, advanced Double Overhead Cam (DOHC) design for its era, reliable shaft drive (on some models, though the 1976 GS750 likely features chain drive), and responsive handling.
Engine:
Complete disassembly, assembly, inspection, and repair of all engine components, including top-end (cylinder head, valves, camshafts), bottom-end (crankshaft, connecting rods, bearings), lubrication system, cooling system (air cooling), and ignition system.
Fuel System:
Carburetor overhaul, adjustment, synchronization, fuel tank, fuel lines, and fuel pump (if applicable).
Transmission:
Clutch operation and adjustment, gearbox disassembly and assembly, gear inspection, shift mechanism, and final drive (chain).
Brakes:
Front and rear brake system overhaul (hydraulic disc brakes), brake fluid specifications, bleeding procedures, pad/shoe replacement, and master cylinder/caliper repair.
Electrical System:
Wiring diagrams, lighting system, charging system (alternator, regulator/rectifier), ignition system (CDI), starter motor, battery service, and electrical component testing.
Suspension:
Front fork service (oil change, seal replacement), rear shock absorber inspection and replacement, and swingarm bushing maintenance.
Chassis And Frame:
Frame inspection, steering head bearing service, wheel bearing maintenance, and general chassis components.
Bodywork And Trim:
Fender removal/installation, fuel tank removal/installation, seat service, and minor body panel adjustments.
Routine Maintenance:
Oil and filter changes, spark plug replacement, chain adjustment and lubrication, air filter cleaning/replacement, brake fluid checks, and general lubrication points.
Troubleshooting:
Diagnostic flowcharts for common starting, running, and electrical issues, with step-by-step solutions.
Engine Overhaul:
Detailed instructions for complete engine tear-down, inspection of internal components, measurement of clearances, and reassembly with torque specifications.
Carburetor Tuning:
Procedures for cleaning, rebuilding, jetting, and synchronizing the Mikuni VM34 carburetors for optimal performance.
Electrical Diagnostics:
Guidance on using multimeters to test stator output, regulator function, ignition coil resistance, and continuity of wiring harnesses.
Suspension Rebuild:
Instructions for fork seal replacement, fork oil level and type specifications, and rear shock absorber testing.
Depth:
Comprehensive, covering everything from basic maintenance and adjustments to complete engine rebuilds, carburetor tuning, and electrical system diagnostics. Suitable for both DIY enthusiasts and professional mechanics.
Configuration:
Inline-Four Cylinder, Air-Cooled
Displacement:
748 cc (45.6 cu in)
Bore X Stroke:
65.0 mm x 56.0 mm (2.56 in x 2.20 in)
Valve Train:
DOHC, 2 Valves per Cylinder
Horsepower:
Approx. 70-74 HP @ 8,000 RPM (claimed)
Torque:
Approx. 45-48 lb-ft @ 6,500 RPM (claimed)
Carburetion:
4 x Mikuni VM34SS (28mm constant velocity carburetors)
Fuel Type:
Unleaded gasoline, 91 octane (or higher)
Type:
CDI (Capacitor Discharge Ignition)
Era Assessment:
No formal crash ratings as per modern standards, but designed with rider control and stability in mind.
Braking System:
Dual Piston Front Disc Brake, Single Piston Rear Disc Brake.
Lighting:
Halogen Headlight, LED tail light (as common upgrade), integrated turn signals.
Frame Construction:
Steel Tube Frame for rigidity and rider protection.
Ergonomics:
Sport-touring riding position offering a balance of comfort and control.
Oil Change:
Every 2,000-3,000 miles (3,000-5,000 km) or 6 months.
Chain Lubrication Adjustment:
Every 500-1,000 miles (800-1,500 km).
Valve Clearance Check:
Every 4,000-6,000 miles (6,000-10,000 km).
Spark Plug Replacement:
Every 6,000-8,000 miles (10,000-12,000 km).
Engine Oil:
SAE 10W-40 or 20W-50 motorcycle-specific oil (API SG or higher). Consult manual for precise recommendations based on temperature.
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid.
Fork Oil:
SAE 10W or 20W fork oil (specific weight and volume detailed in manual).
Common Problems:
Carburetor synchronization drift, weak or failed regulator/rectifier, general wear on suspension bushings, potential for oil leaks due to age of seals.
Preventative Maintenance Focus:
Regularly cleaning and synchronizing carburetors, checking electrical connections for corrosion, and ensuring proper lubrication of moving parts are key.
Founding:
Suzuki Motor Corporation, founded in 1909.
Motorcycle Division Start:
Began motorcycle production in 1952.
Predecessors:
Suzuki's earlier models like the GT series (2-stroke) and early 4-strokes laid the groundwork for this more advanced machine.
Successors:
The GS750 evolved into the GS850, GS1000, and the GSX series, establishing Suzuki's reputation for smooth, reliable inline-four engines.
Production Years:
1976-1977 (for the initial GS750 model before updates)
Manufacturing Location:
Japan
