Segment:
Entry-level to intermediate off-road/dirt bike, popular for recreational riding and youth motocross.
Key Competitors:
Honda CRF100F/CRF125F, Kawasaki KLX110/KLX125, Suzuki DR-Z110/DR-Z125.
Design Philosophy:
Robust, user-friendly, and reliable platform for off-road adventures, offering different seat heights and features for various rider levels.
Variant Differentiation:
S (Standard), E (Electric Start), LW (Long Wheelbase), LWE (Long Wheelbase Electric Start) cater to different rider preferences and experience levels.
Manual Type:
Factory Service Repair Workshop Manual
Language:
English (assumed, standard for factory manuals sold internationally)
Format:
Likely digital (PDF) based on description, but original might have been print.
Estimated Page Count:
200-300 pages (typical for a comprehensive service manual of this type)
Completeness Statement:
100% complete, detailed illustrations, step-by-step instructions
Engine Overhaul:
Complete disassembly, inspection, repair, and reassembly procedures for the engine.
Fuel System:
Carburetor tuning, cleaning, and overhaul (likely Mikuni VM26 or similar).
Ignition System:
CDI ignition system testing and troubleshooting.
Lubrication System:
Oil pump, oil passages, and lubrication checks.
Cooling System:
Air-cooled engine specifications and maintenance.
Transmission:
5-speed transmission disassembly, inspection, and repair.
Drivetrain:
Chain and sprockets maintenance, adjustment, and replacement.
Suspension Front:
Front fork disassembly, oil changes, seal replacement, and troubleshooting.
Suspension Rear:
Rear shock absorber inspection, adjustment, and linkage maintenance.
Brakes Front:
Hydraulic disc brake system maintenance, pad replacement, caliper overhaul, bleeding.
Brakes Rear:
Drum brake system inspection and adjustment.
Wheels Tires:
Wheel bearing maintenance, tire pressure, and replacement advice.
Electrical System:
Lighting, horn, battery, starter motor (kick-start primary), and wiring diagrams.
Frame Chassis:
Frame inspection, steering bearing maintenance.
Bodywork:
Plastic body panel removal, installation, and care.
Routine Maintenance:
Oil changes, filter cleaning/replacement, chain adjustment, spark plug checks.
Troubleshooting Guides:
Systematic diagnostic procedures for common starting, running, and electrical issues.
Engine Rebuild Procedures:
Detailed steps for top-end and bottom-end engine rebuilds.
Carburetor Rebuild:
Step-by-step guide for carburetor disassembly, cleaning, and reassembly with jetting information.
Suspension Servicing:
Front fork oil replacement and rear shock adjustment instructions.
Brake System Service:
Brake fluid replacement, bleeding, and pad/shoe replacement.
Electrical Diagnostics:
Use of wiring diagrams for troubleshooting electrical faults.
Torque Specifications:
Torque values for all critical fasteners and engine components.
Diagnostic Level:
Comprehensive diagnostics covering engine performance, electrical circuits, and mechanical systems.
Repair Scope:
From basic maintenance to complete engine and transmission rebuilds.
Special Tools:
Identifies specific Yamaha special tools required for certain procedures.
Digital File Type:
PDF (Portable Document Format) - highly probable for digital distribution.
Image Resolution:
High-resolution scans of original factory manual pages ensuring clarity of illustrations and text.
Text Searchability:
Searchable text layer within the PDF for quick information retrieval.
Original Format Binding:
Likely a bound paper manual (spiral-bound or stapled booklet).
Original Format Paper:
High-quality paper stock, typical for service manuals, designed for durability in a workshop environment.
Engine Type:
Air-cooled, four-stroke, SOHC
Bore X Stroke:
54 mm x 54.5 mm
Compression Ratio:
9.5:1 (typical for this model, confirm in manual)
Carburetor:
Mikuni VM26 (or similar specification, e.g., VM26-85)
Horsepower:
Approximately 10-12 HP (estimated, varies by specific model and tuning)
Torque:
Approximately 7-8 lb-ft (estimated)
Fuel Type:
Unleaded gasoline (91 octane or higher recommended)
Fuel Capacity:
1.6 US gallons (6.0 L)
Overall Length:
LW/LWE: Approx. 73.6 in (1870 mm); Standard/E: Approx. 70.9 in (1800 mm)
Overall Width:
Approx. 31.5 in (800 mm)
Overall Height:
LW/LWE: Approx. 44.1 in (1120 mm); Standard/E: Approx. 42.7 in (1085 mm)
Wheelbase:
LW/LWE: Approx. 50.4 in (1280 mm); Standard/E: Approx. 48.8 in (1240 mm)
Dry Weight:
Approx. 169 lbs (76.5 kg) for LWE; approx. 163 lbs (74 kg) for E; Standard versions slightly lighter.
Curb Weight:
Not typically specified for dirt bikes, but would include fluids and battery.
Ground Clearance:
LW/LWE: Approx. 11.0 in (279 mm); Standard/E: Approx. 9.5 in (240 mm)
Seat Height:
LW/LWE: Approx. 31.9 in (810 mm); Standard/E: Approx. 30.5 in (775 mm)
Engine Oil Change:
Every 1000 km (600 miles) or 6 months, whichever comes first. More frequent for heavy use.
Air Filter Cleaning:
Every 1000 km (600 miles), or more often in dusty conditions.
Spark Plug Inspection:
Every 3000 km (2000 miles).
Chain Lubrication Adjustment:
Every 500 km (300 miles) or after washing/riding in wet conditions.
Valve Clearance Check:
Every 6000 km (4000 miles).
Engine Oil Type:
Yamalube 4 (or equivalent) SAE 10W-40, API SG or higher, JASO MA certified.
Engine Oil Capacity:
0.95 US qt (0.90 L) without filter change; 1.00 US qt (0.95 L) with filter change.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid.
Carburetor Idling:
Can be prone to bogging or rough idling if not kept clean or properly adjusted, especially the stock VM26.
Suspension Wear:
Front fork seals can wear over time, leading to oil leaks, especially with aggressive use.
Electrical Connections:
Corrosion or loose connections in the wiring harness can cause intermittent electrical issues.
