Positioning:
Suzuki's mid-range offering in the early to mid-70s, bridging the gap between smaller twins and larger triples.
Competitors:
Kawasaki H2 Mach IV, Yamaha RD350/RD400, Honda CB400 Four, Triumph Trident
Features:
Unique three-cylinder, two-stroke engine with Ram Air induction for enhanced performance and cooling.
Design Philosophy:
Balance of performance, handling, and usability in the sport-touring segment.
Value:
Essential resource for owners and mechanics for maintenance, repair, and restoration.
Primary Coverage:
Suzuki GT380
Applicable Years:
1972-1978
Additional Coverage Note:
Will work with similar years and models
Estimated Page Count:
Variable (Digital, printable sections)
Type:
Service Repair Workshop Manual
Delivery Format:
Digital Download (Adobe Acrobat PDF)
Engine:
Comprehensive Engine Service, Rebuild, and Tuning
Transmission:
Gearbox Inspection, Repair, and Clutch Assembly
Chassis:
Frame Inspection, Suspension, and Wheel Bearings
Steering:
Handlebar, Triple Clamps, and Steering Head Bearings
Brakes:
Front and Rear Brake System Service and Adjustment
Electrical:
Ignition System, Lighting, Charging System, and Wiring Diagrams
Fuel System:
Carburetor Tuning, Fuel Tank, and Fuel Lines
Lubrication:
Oil Pump, Mixture Ratios, and Lubrication Points
Suspension:
Front Forks and Rear Shock Absorbers
Bodywork:
Seat System, Locks, and General Components
Maintenance:
Routine Service, Fluid Changes, and Adjustments
Troubleshooting:
Diagnostic Procedures for Common Issues
Repair:
Step-by-step Disassembly and Reassembly Instructions
Engine Rebuild:
Complete Engine Rebuild Procedures, including Piston and Crankshaft Replacement
Carburetor Tuning:
Detailed Carburetor Synchronization and Jetting Information
Electrical Diagnostics:
Wiring Diagram Interpretation and Fault Finding
Depth:
Comprehensive - from basic maintenance to complete engine rebuilds and advanced electrical diagnostics.
Format:
Adobe Acrobat PDF
Searchability:
Searchable Text Content
Printability:
Printable - User can print individual sections or entire manual.
Binding:
Not Applicable (Digital Download)
Paper Type:
Not Applicable (Digital Download)
Operating Systems:
PC and Mac Compatible
Delivery:
Instant Digital Delivery via Download Link
Internet Requirement:
High-Speed Internet Recommended (Large File Sizes)
Configuration:
Air-cooled, Two-stroke, Inline Three-cylinder
Displacement:
371 cc (22.6 cu in)
Bore X Stroke:
54.0 mm x 81.0 mm (2.13 in x 3.19 in)
Compression Ratio:
7.0:1 (approx.)
Horsepower Net:
34 hp @ 7,000 rpm (varies by year and market)
Torque Net:
36 Nm (26.5 lb-ft) @ 6,000 rpm (approx.)
Carburetors:
3 x Mikuni VM30SC (or similar VM series) 30mm constant velocity carburetors
Fuel Type:
Unleaded gasoline with 2-stroke oil mix (typically 50:1 or 32:1 ratio)
Ignition Type:
CDI (Capacitor Discharge Ignition)
Oil Delivery:
Suzuki Point-Lubrication (SPL) oil injection system
Cooling System:
Forced Air Cooling (Ram Air induction system)
Oil Change:
Refer to Manual (e.g., every 3,000-5,000 km or as per manual)
Spark Plug Check:
Refer to Manual (e.g., every 3,000-6,000 km)
Chain Lubrication:
Regularly (e.g., every 500 km or after washing/rain)
Carburetor Cleaning Tune:
As needed, or every 6,000-10,000 km
Engine Oil Type:
2-stroke Engine Oil (specific API or JASO rating as per manual, e.g., JASO FB or API TC)
Brake Fluid Type:
DOT 3 or DOT 4 (check manual for specific recommendation)
Fork Oil Type:
Refer to Manual for viscosity (e.g., SAE 10W or 15W)
Known Issues Common:
Crankshaft seal leaks, CDI ignition module failure, carburetor gumming, reed valve wear.
Common Repairs:
Top-end rebuilds (pistons, rings), crankshaft seal replacement, electrical system diagnosis.
Spark Plug Part Number:
NGK B8ES or equivalent (verify with manual)