This manual covers various 125cc two-stroke models, reflecting a strong heritage in performance-oriented motorcycles, particularly within the competitive 125cc class. An Italian manufacturer with a significant racing pedigree, these agile and potent machines were produced from the late 20th century through the early 2000s. Known for their spirited performance, these two-stroke engines typically feature a single-cylinder configuration, air cooling, and a potent expansion chamber exhaust system, often paired with a 6-speed manual transmission and a wet, multi-plate clutch. This comprehensive workshop service and repair manual provides factory-level, highly detailed information essential for maintaining and repairing your 125cc two-stroke motorcycle. It covers all critical systems, including the engine, transmission, fuel, ignition, cooling, exhaust, chassis, suspension, braking, and electrical systems. The manual includes step-by-step procedures for preventative maintenance, troubleshooting, engine rebuilds, carburetor adjustments, suspension overhauls, brake system servicing, and electrical component testing, all supported by hundreds of illustrations and specific torque values. 🏷️ Basic Information Identification Make: Gilera Model: Various 125cc Two-Stroke Models Codes Engine Type Designator: Two-Stroke Engine Displacement Designator: 125ccm 👋 Introduction Market Position Value Proposition: Inexpensive way to maintain and repair vehicle, ensuring proper working order Competitive Analysis Competitor Alternatives: Generic repair guides, less detailed online resources, expensive OEM manuals Key Features Detail Level: Highly detailed factory-level information Instruction Style: Step-by-step instructions based on complete disassembly Completeness: 100% complete and intact Accessibility: Downloadable PDF for immediate use on various operating systems 📋 Manual Details Coverage Areas Primary Coverage: Workshop Service and Repair Page Count Estimated Page Count: Extensive (Specific count not provided, but described as 'highly detailed' and '100% complete') Manual Type Type: Factory Service Manual / Workshop Manual Language Language: English (Implied by product description) Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: Comprehensive (Diagnosis, disassembly, assembly, tuning, troubleshooting) Transmission: Coverage expected for gearbox, clutch, and related components Fuel System: Carburetor tuning, fuel delivery, fuel tank servicing Ignition System: Spark plug, ignition timing, CDI unit (if applicable) Cooling System: Air cooling system maintenance and inspection Exhaust System: Two-stroke exhaust system (expansion chamber) tuning and maintenance Chassis Frame: Frame inspection, alignment, and component mounting Suspension: Front forks (telescopic) and rear shock absorber servicing and adjustment Braking System: Front and rear brake servicing (drum or disc, depending on model variant) Electrical System: Wiring diagrams, lighting, battery, charging system (if applicable) Bodywork Panels: Fairings, seat, fuel tank removal and installation Procedures Included Preventative Maintenance: Regular servicing, inspections, fluid changes, filter replacements Troubleshooting: Diagnostic charts and procedures for common and uncommon issues Engine Rebuild: Complete engine disassembly, component inspection, replacement, and reassembly Carburetor Adjustment: Detailed steps for jetting, idle speed, and mixture control Suspension Overhaul: Fork seal replacement, oil changes, shock absorber servicing Brake System Maintenance: Pad replacement, fluid bleeding, caliper servicing Electrical Component Testing: Testing of ignition coil, stator, regulators, and other electrical parts Torque Specifications: Crucial torque values for engine, chassis, and suspension fasteners Special Tool Requirements: Identification of necessary special tools for specific procedures Technical Depth Depth: Expert/Advanced (Covers complete disassembly to detailed rebuilds and diagnostics) Illustrations Photos: Hundreds of detailed illustrations and photos Target Audience: DIY enthusiasts and experienced mechanics 📊 Manual Specifications File Format Format: PDF Compatibility: Windows and Mac OS Print Quality Printability: All pages printable Searchability: Implied searchable text within PDF Binding Type Binding: N/A (Digital PDF download) Paper Type Paper Type: N/A (Digital PDF download) ⚙️ Engine Specifications Primary Engine Configuration: Two-Stroke, Single-Cylinder (typical for 125cc Gilera models) Cooling Method: Air-cooled (typical) Bore X Stroke: Specifics vary by model, but common for 125cc would be around 54mm x 54.5mm Compression Ratio: Specifics vary by model, typically 7.0:1 to 9.0:1 for performance two-strokes Intake System: Carburetor (e.g., Dell'Orto PHBH, Mikuni VM series, specific to model) Exhaust Type: Expansion Chamber (critical for two-stroke performance tuning) Performance Horsepower: Varies significantly by model and tuning, typically 20-30 HP for road-going versions, higher for race variants Torque: Specifics vary by model, but focused on mid-range power delivery Fuel System Fuel Type: Unleaded gasoline with two-stroke oil mixture (pre-mix or autolube system, depending on model) Oil Delivery: Autolube (oil injection) or pre-mix, depending on specific 125cc model Carburetor Size: Commonly 28mm to 34mm for performance 125cc models 🔧 Transmission Standard Type: Manual, Sequential Gearbox Number Of Gears: Typically 6-speed Optional Optional Gearboxes: N/A (Manual gearbox is standard for this class) Features Clutch Type: Wet, Multi-plate Clutch Gear Ratios: Specific ratios vary by model and intended use (e.g., street, racing) Final Drive: Chain Drive 📐 Dimensions Exterior Length Overall: Varies significantly by model (e.g., sportbike, naked, enduro) Width Overall: Varies significantly by model Height Overall: Varies significantly by model Wheelbase: Varies significantly by model, typically 1300mm - 1450mm Weights Dry Weight: Varies significantly by model, typically 100kg - 130kg Fuel Capacity: Varies by model, typically 8-15 Liters 🛡️ Safety Features Ratings Crash Test Ratings: N/A (Motorcycle safety is assessed...