Model Variants:
All GS250 and GS450 models
Production Years Covered:
1979-1985
Chassis Codes:
GS250FW, GS450ET, GS450EX, GS450GA, GS450GZ
Market Position:
A vital resource for owners and independent mechanics of the Suzuki GS250 and GS450 motorcycles from the 1979-1985 era, offering dealership-level repair information at an accessible price.
Value Proposition:
Provides significant cost savings by enabling DIY repairs and maintenance, avoiding expensive dealership labor charges. Offers comprehensive coverage that generic manuals often lack.
Key Features:
Covers all models and repairs A-Z, includes extensive diagrams and pictures, printable pages, instant download delivery, lifetime usage, professional quality.
Target Audience:
Suzuki GS250/GS450 owners, motorcycle enthusiasts, independent repair shops, and hobbyists performing maintenance and repairs on these specific models.
Coverage Areas:
Comprehensive coverage of all mechanical and electrical repairs, routine maintenance, tune-up procedures, troubleshooting, and specifications for all GS250 and GS450 models.
Page Count:
Not explicitly stated, but described as 'Tons of detailed pictures & diagrams' and covering A-Z repairs, suggesting a substantial volume.
Manual Type:
Workshop Service Repair Manual
Delivery Method:
Instant Digital Download
Engine Systems:
Engine removal/installation, cylinder head/valve train, engine block, lubrication, intake manifold, exhaust system, cooling, heating, fuel system, emissions control, engine repair, ignition.
Transmission Drivetrain Systems:
Transaxle, clutch, manual transmission, differential, driveshaft, chain and gear valve timing, sprocket/gear timing.
Chassis Systems:
Steering, suspension, brakes (including ABS if applicable to models within the range), bodywork.
Electrical Systems:
Complete electrical system coverage, including wiring diagrams, SRS (Supplemental Restraint System).
Comfort Systems:
Heater and air conditioning, automatic climate control.
Maintenance Procedures:
Routine maintenance, tune-up procedures, valve timing procedures, tensioner adjustments, timing mark alignment, chain routing.
Repair Procedures:
All repairs A-Z, mechanical repairs, electrical repairs, general removal and installation instructions, engine repair, transmission repair, brake repair, steering and suspension repair, bodywork repair.
Troubleshooting:
Implicitly covered within the detailed repair and diagnostic information.
Technical Depth:
Extensive, covering everything from basic maintenance and tune-ups to complex engine rebuilds, electrical diagnostics, and component-level repairs. Includes detailed specifications and diagrams.
File Format:
Portable Document Format (PDF)
File Compatibility:
Compatible with all PC/MAC computers running Windows (XP, NT, 2000, Vista, 7, 8, 10, 11) and macOS.
Print Quality:
High-quality, suitable for printing individual pages or entire sections as needed. Described as 'PROFESSIONAL QUALITY'.
Binding Type:
N/A (Digital download, no physical binding)
Paper Type:
N/A (Digital download, no physical paper)
Licensing:
Lifetime usage, no expiration or time-out.
Searchability:
Assumed to be searchable as a standard PDF document.
Engine Type Gs250:
Air-cooled, four-stroke, DOHC, parallel-twin
Displacement Gs250:
248 cc (15.1 cu in)
Engine Type Gs450:
Air-cooled, four-stroke, DOHC, parallel-twin
Displacement Gs450:
447 cc (27.3 cu in)
Bore X Stroke Gs250:
57.0 mm x 48.8 mm (2.24 in x 1.92 in) - Approximate, specific to model variant
Bore X Stroke Gs450:
65.0 mm x 64.4 mm (2.56 in x 2.54 in) - Approximate, specific to model variant
Horsepower Gs450:
Approx. 45-50 HP (depending on variant and market tuning)
Fuel System Type:
Carbureted (e.g., Mikuni VM dual carburetors)
Valve Adjustment Intervals:
Typically every 6,000-12,000 km (3,700-7,500 miles), refer to manual for exact specification.
Transmission Type:
5-speed constant mesh manual transmission
Optional Transmission:
Some GS450 models featured shaft drive and a different transmission configuration, refer to manual for specifics.
Clutch Type:
Wet multi-plate clutch
Final Drive:
Chain drive (typical), some models may have shaft drive.
Safety Ratings:
N/A (Motorcycle safety ratings typically not standardized in this era for consumer reporting)
Braking System:
Front: Disc brake, Rear: Drum brake (some higher-spec models may have dual front discs or rear disc)
Lighting:
Halogen headlight, taillight, turn signals
Controls:
Standard handlebar controls, footpegs, and shifter.
Infotainment System:
N/A (Analog instrumentation: speedometer, tachometer, odometer, fuel gauge, indicator lights)
Driver Assistance Features:
N/A (No electronic driver assistance systems)
Connectivity Features:
N/A
Oil Change Interval:
Typically every 3,000-6,000 km (1,800-3,700 miles) or annually, refer to manual for precise intervals.
Spark Plug Replacement:
Refer to manual for recommended intervals, typically around 10,000-15,000 km (6,200-9,300 miles).
Chain Lubrication Adjustment:
Regularly, every 500-1,000 km (300-600 miles) and after riding in wet conditions.
Engine Oil Type:
API SE or SF, SAE 20W-40 or 10W-40 motorcycle specific oil. Refer to manual for exact viscosity and specification.
Engine Oil Capacity:
Approx. 2.0 - 2.5 liters (2.1 - 2.6 US quarts) with filter change. Refer to manual.
Brake Fluid Type:
DOT 3 or DOT 4 (if equipped with disc brakes). Refer to manual.
Fork Oil Type:
Specific motorcycle fork oil viscosity (e.g., SAE 10W or 15W). Refer to manual for capacity and type.
Common Issues:
Carburetor synchronization and cleaning, aging electrical components (wiring, rectifier/regulator), wear on steering head bearings, fork seal leaks, and clutch wear due to age.
Ignition System:
Potential issues with CDI units or ignition coils over time. Maintenance of ignition points (if applicable) is crucial.
Brand Heritage:
Suzuki Motor Corporation is a Japanese manufacturer known for its range of motorcycles, automobiles, and marine engines. The GS series represented Suzuki's foray into robust, reliable, and performance-oriented street bikes.
Model Evolution:
The GS250 and GS450 were part of Suzuki's popular GS series of four-stroke motorcycles introduced in the late 1970s. They evolved from earlier GS models, offering improved engineering, performance, and reliability. The parallel-twin engine configuration was a common and successful design for this displacement class.
Production Era:
The GS250 and GS450 were key models in Suzuki's lineup during the late 1970s and early 1980s, competing effectively against similar offerings from Honda, Kawasaki, and Yamaha.
