Segment:
Entry-level off-road motorcycle, known for its approachable power delivery and suitability for younger riders or trail riding.
Competitors:
Competed with other small displacement trail bikes from manufacturers like Yamaha (YZ80), Honda (CR80R, XR80R), and Suzuki (RM80).
Features:
Lightweight design, easy-to-manage power, durable construction, capable suspension for off-road use, simple maintenance.
Applicable Years:
1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988
Type:
Workshop Service Manual / Repair Manual
Engine:
Complete engine disassembly, assembly, tuning, troubleshooting, component inspection, rebuild procedures
Fuel System:
Carburetor adjustment, cleaning, rebuilding; fuel tank, fuel lines, and petcock service
Transmission:
Gearbox disassembly, inspection, assembly, shift mechanism, clutch operation
Suspension:
Front fork (telescopic) service, oil changes, seal replacement, rear shock absorber inspection and maintenance
Brakes:
Drum brake systems (front and rear) adjustment, inspection, shoe replacement, linkage lubrication
Electrical System:
Ignition system (CDI), lighting, wiring diagrams, battery maintenance, troubleshooting
Cooling System:
Air-cooled engine management and troubleshooting
Chassis And Frame:
Frame inspection, swingarm, bearings, wheel spokes, and general chassis component service
Controls:
Handlebar, levers, cables (throttle, clutch), footpegs, and shifter adjustment and maintenance
Exhaust System:
Exhaust pipe and muffler inspection and maintenance
Maintenance:
Periodic maintenance schedules, lubrication points, filter replacements, general upkeep
Troubleshooting:
Diagnostic procedures for common starting, running, and performance issues
Repair:
Detailed step-by-step instructions for component repair and replacement
Disassembly Assembly:
Comprehensive instructions for taking apart and reassembling all major vehicle systems
Adjustments:
Carburetor jetting, ignition timing, clutch, brake, and cable adjustments
Installation:
Procedures for installing new or replacement parts
Depth:
Comprehensive workshop-level detail, suitable for experienced mechanics and dedicated DIY enthusiasts. Includes technical specifications, diagrams, and troubleshooting guides.
Engine Size:
79cc (actual displacement may vary slightly based on specific bore/stroke)
Bore X Stroke:
Typically around 44.0 x 42.0 mm (subject to confirmation from official specs)
Ignition System:
CDI (Capacitor Discharge Ignition)
Starting System:
Kickstarter
Carburetor:
Typically a single Mikuni VM series carburetor (e.g., VM20 or VM22, specific size varies by year/region)
Horsepower:
Estimated 9-12 HP (figures vary, not officially published for all model years)
Torque:
N/A (not typically published for this class of motorcycle)
Fuel Type:
Unleaded gasoline with 2-stroke oil mixture (e.g., 20:1 or 32:1 depending on oil type and manufacturer recommendation)
Fuel Capacity:
Approximately 1.2 - 1.5 US gallons (4.5 - 5.7 Liters)
Wheelbase:
Approximately 48.8 inches (1240 mm)
Length:
Approximately 69.5 inches (1765 mm)
Width:
Approximately 30.7 inches (780 mm)
Height:
Approximately 42.1 inches (1070 mm)
Dry Weight:
Approximately 150-155 lbs (68-70 kg)
Wet Weight:
N/A (not typically published for this model)
Oil Change:
Recommended every 500-1000 miles (800-1600 km) or annually, depending on usage.
Air Filter Cleaning:
Every 5-10 riding hours or as needed based on dusty conditions.
Spark Plug Replacement:
Every 1000-2000 miles (1600-3200 km) or as needed, depending on condition.
Chain Lubrication And Adjustment:
Regularly, every 300-500 miles (500-800 km) or after washing.
Transmission Oil:
Typically SAE 10W/30 or SAE 80 gear oil (refer to manual for exact specification, e.g., API GL-4).
Fork Oil Type:
Specific suspension fluid (e.g., Showa SS-8, Kayaba KAS, or equivalent SAE 5W/10W fork oil). Capacity is approximately 300-350cc per fork leg, check manual.
2 Stroke Oil:
High-quality 2-stroke motorcycle oil (e.g., JASO FD or API TC rated).
Carburetor Issues:
Clogging due to fuel varnish, float bowl needle wear, leading to rich or lean conditions.
Engine Sealing:
Potential for crankcase seal leaks, leading to air leaks and performance problems.
Clutch Slippage:
Wear on clutch plates or improper adjustment can lead to slippage.
Suspension Wear:
Worn fork seals and rear shock bushings are common on older models, affecting ride quality.
Electrical Connections:
Corrosion or looseness in electrical connectors can cause intermittent issues.
