1988 GSXR 750 Service Manual

The 1988 Suzuki GSXR 750 is a high-performance sport motorcycle featuring a 749cc liquid-cooled four-stroke inline-four engine, dual overhead camshafts, 4-into-1 exhaust system, aluminum frame, anti-dive front forks, full fairing, and digital instrumentation. This service manual covers maintenance procedures, specifications, troubleshooting, and repair instructions for proper servicing and optimal performance.

General Information

This manual provides technical information for the 1988 Suzuki GSXR 750. Includes safety precautions, tool requirements, and general service procedures.

Specifications

• Engine: 749cc, 4-cylinder, liquid-cooled, DOHC, 16-valve
• Bore x Stroke: 70.0mm x 48.7mm
• Compression Ratio: 10.7:1
• Fuel System: Mikuni BST34SS carburetors (4)
• Ignition: Electronic CDI
• Lubrication: Wet sump
• Oil Capacity: 3.2 liters (with filter change)
• Fuel Capacity: 18 liters
• Seat Height: 785mm
• Wheelbase: 1450mm
• Dry Weight: 198kg

Periodic Maintenance

Regular maintenance schedule for optimal performance and longevity.

1. Every 1000km/600mi: Check chain tension and lubricate
2. Every 5000km/3000mi: Change engine oil and filter
3. Every 10,000km/6000mi: Check valve clearances
4. Every 15,000km/9000mi: Replace spark plugs
5. Every 20,000km/12,000mi: Replace air filter, check carburetor synchronization
6. As needed: Check brake pads, tire pressure, fluid levels

WARNING! Always use genuine Suzuki parts and recommended lubricants. Disconnect battery before electrical work.

Engine Service

Detailed procedures for engine maintenance and repair.

1. Valve Clearance Adjustment: Check when engine cold (0.10-0.15mm intake, 0.15-0.20mm exhaust)
2. Cylinder Head Removal: Drain coolant, remove camshafts, lift head carefully
3. Piston and Cylinder: Inspect for wear, measure cylinder bore
4. Crankshaft and Connecting Rods: Check bearing clearances and runout
5. Clutch: Adjust cable free play (10-15mm at lever)
6. Oil Change: Use SAE 10W-40 motorcycle oil, replace crush washer

CAUTION! Torque cylinder head bolts in proper sequence to specified values.

Fuel System

Carburetor maintenance and fuel system service.

1. Carburetor Synchronization: Use vacuum gauges to balance all four carburetors
2. Float Level Adjustment: Set to 21.5mm ± 1.0mm
3. Pilot Screw Setting: Factory setting: 2-1/4 turns out
4. Fuel Filter: Replace if clogged or every 2 years
5. Throttle Cable: Lubricate and check for smooth operation

Tip: Clean carburetor jets with compressed air, never with wire.

Electrical System

Battery, charging system, and ignition service.

Testing: Check battery voltage (12.6V min), charging voltage (13.5-15.0V at 5000rpm)

Chassis & Suspension

Frame, suspension, and steering maintenance.

1. Front Fork Service: Check oil level (165mm from top), replace seals if leaking
2. Rear Shock Adjustment: Preload: 5 positions, Rebound damping: 4 positions
3. Steering Head Bearings: Check for play, adjust as needed
4. Swingarm Pivot: Lubricate every 2 years or 20,000km
5. Wheel Alignment: Check chain adjusters for equal measurement

WARNING! Always support motorcycle securely when working on suspension components.

Brake System

Hydraulic brake system maintenance and repair.

1. Brake Fluid: Use DOT 4, replace every 2 years
2. Brake Pad Replacement: Replace when worn to 1mm thickness
3. Brake Disc Inspection: Check for warpage (max 0.3mm runout)
4. Bleeding Procedure: Start with farthest caliper from master cylinder
5. Master Cylinder: Check for leaks, rebuild if necessary

CAUTION! Brake fluid damages paint - clean spills immediately.

Troubleshooting

Note: Always diagnose systematically from simplest to most complex causes.

Wiring Diagrams

Complete electrical schematics for the 1988 GSXR 750. Includes color-coded wiring, connector locations, and component identification.

Key Circuits: Ignition system, charging system, lighting, instrumentation, starting circuit

Service Contact: For technical support, contact authorized Suzuki dealership or visit Suzuki technical publications.