Segment:
Lightweight sportbike, 250cc class, known for performance and handling.
Competitors:
Yamaha RZ250, Kawasaki KR250, Honda CBR250R (though the RG250 was more of a direct competitor to the RZ).
Engine Type:
Liquid-cooled, two-stroke, parallel-twin engine.
Frame Type:
Aluminium alloy twin-spar frame (a significant feature for its era).
Suspension System:
Monoshock rear suspension with Suzuki's proprietary 'Full Floater' linkage system.
Performance Reputation:
Renowned for its sharp handling, quick acceleration, and race-inspired design.
Engine:
Complete engine overhaul, disassembly, assembly, inspection, tuning, and troubleshooting for the 247cc liquid-cooled two-stroke twin-cylinder engine.
Fuel System:
Carburetor (Mikuni VM26SS typical) disassembly, cleaning, adjustment, specifications, and troubleshooting.
Transmission:
6-speed constant mesh gearbox, clutch operation, inspection, and service.
Ignition System:
CDI ignition system, spark plug specifications, timing checks, and component testing.
Cooling System:
Liquid cooling system, radiator, coolant specifications, pump operation, and bleeding procedures.
Suspension:
Front telescopic forks (likely Showa or Kayaba), rear monoshock (Full Floater system), fork oil specifications, seal replacement, damping adjustments, and linkage maintenance.
Brakes:
Front and rear disc brake systems, caliper overhaul, pad replacement, fluid type and bleeding procedures, master cylinder inspection.
Electrical System:
Wiring diagrams, lighting system, charging system (stator, rectifier/regulator), battery specifications, starter motor, and fuse box.
Chassis And Bodywork:
Frame inspection, steering head bearing service, body panel removal and installation, seat, tank, fairing, and exhaust system.
Maintenance:
Scheduled maintenance, oil changes, filter replacements, chain adjustment, lubrication points, and general upkeep.
Troubleshooting:
Diagnostic procedures for common issues, symptom-based fault finding, and repair recommendations.
Repair:
Step-by-step instructions for disassembly, component repair, and reassembly of all major vehicle systems.
Adjustment:
Carburetor synchronization, ignition timing, clutch adjustment, throttle cable play, and suspension settings.
Installation:
Procedures for installing new parts or accessories, as well as proper assembly of components.
Depth:
Comprehensive, covering from basic maintenance and adjustments to complete engine and transmission rebuilds. Includes detailed specifications and diagnostic information.
Digital Format:
PDF (common for scanned manuals, searchable if OCR'd)
Quality:
Likely scanned from original factory documents, quality may vary. High-resolution scans are preferable for clarity of diagrams and text.
Binding:
Wire-O or perfect bound (if a professionally reprinted version)
Paper Quality:
Durable paper stock suitable for workshop environments (typical of factory manuals).
Engine Type:
2-stroke, liquid-cooled, parallel-twin
Bore X Stroke:
54.0 mm x 54.0 mm
Compression Ratio:
7.2:1 (typical, may vary slightly by market)
Power Delivery:
Suzuki T.R.A.C. (Torque Responsive Atomized Control) system or similar reed valve induction for improved mid-range torque.
Horsepower:
Approx. 45-47 PS (33-34.5 kW) at 9,000 rpm (typical for European/Japanese models)
Torque:
Approx. 33 Nm (24 lb-ft) at 8,500 rpm (typical)
Carburetor Type:
Dual Mikuni VM26SS (or similar 26mm constant velocity carburetors)
Fuel Type:
Unleaded gasoline (91 RON or higher recommended)
Fuel Mixture:
Pre-mix or oil injection system (CCI - Crankcase Cylinder Injection typical for Suzuki)
Ignition Type:
CDI (Capacitor Discharge Ignition)
Oil Change:
Every 3,000-5,000 km or annually (refer to manual for specific recommendations).
Spark Plug Replacement:
Every 6,000-8,000 km.
Chain Lubrication Adjustment:
Every 1,000 km or as needed.
Fork Oil Change:
Every 10,000-15,000 km or if performance degrades.
Engine Oil Type:
2-stroke specific oil for oil injection system (e.g., Yamalube 2M, Castrol TTS, Motul 510 2T) - refer to manual for exact Suzuki specification.
Fork Oil Viscosity:
Suzuki Fork Oil SS-05 or equivalent SAE 5W / SAE 10W (check manual for precise grade).
Brake Fluid Type:
DOT 3 or DOT 4 (refer to manual for specific recommendation).
Coolant Type:
Ethylene glycol-based coolant mixed with distilled water (50/50 ratio recommended).
Two Stroke Wear:
Piston, rings, and cylinder wear due to high-performance two-stroke operation, requiring periodic inspection and rebuild.
Carburetor Issues:
Fuel delivery problems, idle instability, or poor throttle response due to gummed-up carburetors from age or improper fuel storage.
Electrical Gremlins:
Corroded connections or failing rectifier/regulator common in older bikes.
Cooling System Leaks:
Aging hoses or seals in the liquid cooling system can lead to leaks.
Suspension Seals:
Worn fork seals are common on vintage motorcycles, leading to oil leaks.
Suzuki Motorcycle Legacy:
Suzuki has a long history in motorcycle racing and performance machines, establishing a reputation for innovative two-stroke technology and sporty handling.
Rg Series:
The RG250 Gamma was part of Suzuki's 'Gamma' series, which emphasized performance and advanced technology, building upon the success of earlier RG models.
Technical Advancements:
Key advancements included the aluminum frame and the Full Floater rear suspension, which were cutting-edge for 250cc sportbikes of the mid-1980s.
Production Period:
The RG250 Gamma was produced from 1983 to 1987, with the 1987 model representing the final iteration of this specific design.
Manufacturing Location:
Japan
