Vehicle Segment:
Youth/Beginner Off-Road Motorcycle
Target Audience:
Young riders, entry-level off-road enthusiasts
Key Competitors:
Honda CRF70F, Suzuki JR80, Kawasaki KLX110 (different displacement but similar market)
Manual Value Proposition:
Provides comprehensive factory-level repair and maintenance data for DIY mechanics and professionals.
Ease Of Use:
Digital format allows for easy searching, printing, and viewing on multiple devices.
Engine Mechanical:
Full overhaul, including cylinder head, piston, crankshaft, valve timing, lubrication system
Fuel System:
Carburetor tuning, cleaning, rebuilding; fuel lines, fuel tank maintenance
Ignition System:
CDI unit, ignition coil, spark plug specifications and testing
Cooling System:
Air-cooled system, heat dissipation, engine temperature monitoring
Exhaust System:
Muffler maintenance, exhaust pipe sealing, heat shields
Transmission Drivetrain:
Clutch operation, gear shifting mechanism, final drive (chain and sprockets)
Chassis Frame:
Frame inspection, welds, engine mounting points
Suspension Front:
Fork inspection, oil replacement, seal replacement, damping adjustments
Suspension Rear:
Shock absorber inspection, spring preload adjustment, linkage lubrication
Brakes Front:
Drum brake inspection, shoe replacement, lever adjustment
Brakes Rear:
Drum brake inspection, shoe replacement, pedal adjustment
Wheels Tires:
Spoke tensioning, rim inspection, tire pressure, tire replacement
Electrical System:
Wiring diagrams, lighting system, battery maintenance, charging system (stator, rectifier)
Bodywork Plastics:
Fairing removal and installation, seat, fenders
Controls Cables:
Throttle cable adjustment, brake cable lubrication and adjustment, clutch cable adjustment
Routine Maintenance:
Oil changes, filter replacement, chain lubrication, spark plug checks, air filter cleaning
Troubleshooting Diagnostics:
Step-by-step fault finding for common and uncommon issues
Engine Overhaul:
Complete engine disassembly, inspection, repair, and reassembly
Carburetor Rebuild:
Detailed instructions for disassembling, cleaning, and reassembling the carburetor
Suspension Fork Rebuild:
Front fork oil change and seal replacement procedures
Brake Adjustment Service:
Front and rear brake adjustment and component replacement
Electrical Component Testing:
Testing of ignition system, lighting, and charging components
Wheel Truing Spoke Tensioning:
Instructions for maintaining wheel alignment and spoke tension
Depth Of Coverage:
Comprehensive, from basic owner maintenance to complete engine and chassis rebuilds
Diagnostic Charts:
Detailed troubleshooting flowcharts for various symptoms
Torque Specifications:
Precise torque values for all critical fasteners
Clearances Tolerances:
Specifications for critical engine and chassis component clearances
Wiring Diagrams:
Detailed, clear electrical system wiring schematics
Engine Type:
Four-stroke, SOHC, air-cooled
Displacement:
88 cc (5.37 cubic inches)
Bore X Stroke:
47 x 51.1 mm (1.85 x 2.01 inches)
Valve Clearance Intake:
0.04 - 0.09 mm (0.0016 - 0.0035 in)
Valve Clearance Exhaust:
0.04 - 0.09 mm (0.0016 - 0.0035 in)
Horsepower Est:
Approx. 7-8 HP (figures vary by source and tuning)
Torque Est:
Approx. 5-6 lb-ft (figures vary by source and tuning)
Carburetor Model:
Mikuni VM17
Fuel Capacity:
2.5 L (0.66 US gal)
Fuel Type:
Unleaded gasoline, 87 octane minimum
Engine Oil Type:
Yamalube 4 (or equivalent SAE 10W-30 API SG or higher)
Engine Oil Capacity:
0.90 L (0.95 US qt) without filter change, 1.00 L (1.06 US qt) with filter change
Engine Oil Change:
Every 1000 km (600 mi) or 6 months, whichever comes first.
Air Filter Cleaning:
Every 1000 km (600 mi) or 6 months; replace if damaged.
Spark Plug Check:
Every 1000 km (600 mi) or 6 months.
Chain Lubrication Adjustment:
Every 500 km (300 mi) or after washing/riding in wet conditions.
Valve Clearance Check:
Every 4000 km (2500 mi) or 24 months.
Engine Oil Spec:
SAE 10W-30 API SG or higher (e.g., Yamalube 4)
Transmission Oil Spec:
SAE 80 API GL-4 (e.g., Yamalube Gear Oil)
Common Wear Items:
Brake shoes, chain and sprockets, tires, fork seals, carburetor jets (clogging).
Carburetor Performance:
Can be prone to clogging due to fuel sitting if not maintained; jetting may require adjustment for altitude/climate.
Electrical Reliability:
While generally robust, wiring connections should be checked for corrosion, especially in wet environments.