Category:
Lightweight Scooter
Target Audience:
Commuters, recreational riders seeking an economical and easy-to-ride urban transport.
Competitors:
Honda Spree, Honda Aero 50, Yamaha Jog, Suzuki Shuttle, various other 50cc and 100cc scooters of the era.
Engine Type:
Reliable 2-stroke, air-cooled engine offering brisk performance for its class.
Transmission:
Automatic CVT provides twist-and-go ease of operation.
Handling:
Lightweight chassis and agile handling make it ideal for city riding and navigating traffic.
Storage:
Under-seat storage compartment for convenience.
Fuel Efficiency:
Excellent fuel economy, making it a cost-effective mode of transportation.
Primary Coverage:
Comprehensive service and repair for Yamaha RIVA 125/Z scooters
Additional Coverage:
Maintenance, troubleshooting, electrical diagrams, specifications
Estimated Page Count:
200-300
Type:
Factory Service Manual / Workshop Manual
Format:
Digital (likely PDF, potentially scanned)
Engine System:
Disassembly, assembly, inspection, diagnosis, repair of the 125cc 2-stroke engine.
Fuel System:
Carburetor tuning, fuel tank, fuel lines, fuel filter servicing.
Ignition System:
CDI unit, ignition coil, spark plug, timing adjustments.
Cooling System:
Air cooling system inspection and maintenance.
Transmission System:
V-belt automatic transmission (CVT) servicing, clutch, and drive pulley maintenance.
Brakes:
Front drum brake, rear drum brake inspection, adjustment, and servicing.
Suspension:
Front telescopic fork and rear shock absorber maintenance and replacement.
Electrical System:
Wiring diagrams, lighting system, starter system, battery, charging system diagnosis.
Chassis Frame:
Frame inspection, body panel removal and installation.
Maintenance:
Oil change, spark plug replacement, air filter cleaning/replacement, brake adjustment, drive belt inspection.
Troubleshooting:
Step-by-step guides for diagnosing common starting, running, and electrical issues.
Repair:
Engine overhaul, carburetor rebuilding, brake component replacement, suspension fork seal replacement.
Diagnostics:
Electrical system testing using multimeters, ignition system timing checks.
Specifications Data:
Torque values, clearances, fluid capacities, electrical resistance values.
Depth:
Comprehensive; covers everything from routine maintenance to complete engine rebuilds and electrical system troubleshooting.
Engine Type:
2-stroke, air-cooled, reed valve induction
Displacement:
113cc (approximately, for 125 model)
Bore X Stroke:
54.0 mm x 49.0 mm (typical for CE50/E236E, confirm with manual)
Compression Ratio:
7.0:1 (typical, confirm with manual)
Horsepower:
~8.0 HP @ 6500 RPM (estimated, varies by specific model year and tuning)
Torque:
~7.5 lb-ft @ 5500 RPM (estimated)
Carburetor Model:
Mikuni VM15SC (typical, confirm with manual)
Fuel Type:
Unleaded gasoline
Fuel Octane Rating:
87 minimum (Octane Number Research Method)
Oil Mixture:
Autolube system (premix not required)
Oil Type Autolube:
Yamalube 2-stroke oil or equivalent API-TC certified oil
Type:
Automatic V-belt Transmission (CVT)
Drive System:
Shaft drive
Clutch Type:
Centrifugal dry clutch
Final Drive Gear Oil Type:
Yamaha Gear Oil SAE 80 API GL-3 (or equivalent)
Final Drive Gear Oil Capacity:
Approximately 100 ml (0.10 L)
Overall Length:
Approx. 1,700 mm (66.9 in)
Overall Width:
Approx. 650 mm (25.6 in)
Overall Height:
Approx. 1,000 mm (39.4 in)
Wheelbase:
Approx. 1,180 mm (46.5 in)
Dry Weight:
Approx. 75 kg (165 lbs)
Wet Weight:
Approx. 80 kg (176 lbs) (estimated)
Weight Distribution:
Typically 45% front / 55% rear (rider dependent)
Front Tire Size:
3.00-10 42J
Rear Tire Size:
3.00-10 42J
Front Brake Type:
Drum brake
Rear Brake Type:
Drum brake
Fuel Tank Capacity:
Approx. 4.0 Liters (1.06 US gal)
Reserve Fuel Capacity:
Approx. 1.0 Liter (0.26 US gal)
Crash Test Ratings:
N/A (Scooters of this era were not typically subjected to standardized crash testing like automobiles).
Braking System:
Standard drum brakes front and rear, requiring manual application.
Lighting:
Headlight, taillight, brake light, turn signals, and indicator lights.
Mirrors:
Two rear-view mirrors for situational awareness.
Body Protection:
Full body fairings to protect rider from elements and debris.
Features:
Basic analog instrumentation: speedometer, fuel gauge, indicator lights (turn signal, oil, neutral).
Features:
None (Vehicle is a simple, mechanical scooter).
First Service:
1,000 km or 1 month (whichever comes first) - includes oil change, filter check, general inspection.
Subsequent Services:
Every 3,000-5,000 km or 6 months - includes major checks, fluid changes, and component inspections.
Spark Plug Replacement:
Every 5,000-8,000 km
Air Filter Cleaning:
Every 1,000-2,000 km; replacement as needed
Drive Belt Inspection:
Every 5,000 km; replacement typically around 15,000-20,000 km
Brake Adjustment:
Check and adjust every 2,000 km or as needed
Engine Oil Type:
Yamalube 2-stroke oil or equivalent API-TC certified oil (for autolube reservoir)
Gear Oil Type:
Yamaha Gear Oil SAE 80 API GL-3 or equivalent
Coolant Type:
N/A (Air-cooled)
Common Wear Items:
Drive belt, variator rollers, brake shoes, spark plug, air filter.
Carburetor Issues:
Clogged jets, float bowl issues leading to rough idling or stalling, especially with age and fuel degradation.
Electrical Gremlins:
Corroded connectors, faulty CDI units, or weak charging systems can occur with age.
Engine Performance Decline:
Loss of compression due to worn piston rings or cylinder, carbon buildup in the exhaust and transfer ports.
Manufacturer:
Yamaha Motor Company, known for innovation and performance in motorcycles, powersports, and audio equipment.
Introduction Period:
The RIVA 125/Z was part of Yamaha's successful scooter lineup in the 1980s and 1990s, evolving from earlier models and paving the way for more advanced scooters.
Key Development:
Focused on reliability, ease of use, and affordability for urban commuting. The 125cc engine offered a step up in performance from 50cc models.
Production Years:
Approximately 1985 to 2001 (as indicated by product info, actual production runs might vary slightly by region).
Manufacturing Locations:
Primarily Japan, with potential assembly in other regions.
