Segment:
Compact scooter, popular for urban commuting and light recreational use.
Competitors Era:
Competed with models like Honda Spree, Elite, and Suzuki Fling during its production run.
Reliability:
Known for Yamaha's reputation for reliable and durable powertrains.
Ease Of Use:
Automatic transmission and user-friendly design make it accessible for riders of all skill levels.
Versatility:
Suitable for daily commuting, errands, and short trips.
Primary Coverage:
Comprehensive service and repair for Yamaha RIVA 125/Z scooters.
Specific Systems Covered:
Engine, transmission, fuel system, electrical system, chassis, suspension, brakes, bodywork, maintenance, troubleshooting, diagnostics.
Estimated Pages:
300-450 (typical for comprehensive service manuals of this era)
Type:
Factory Service Manual / Workshop Manual
Engine:
Detailed disassembly, assembly, inspection, repair, and adjustment procedures for the 125cc engine (likely 4-stroke, air-cooled).
Transmission:
Automatic CVT (Continuously Variable Transmission) service, belt inspection/replacement, roller weight, clutch operation.
Fuel System:
Carburetor service, adjustment, cleaning, fuel pump operation (if applicable), fuel line inspection.
Electrical System:
Wiring diagrams, ignition system testing, charging system (stator, regulator/rectifier), lighting, starter motor, battery maintenance.
Chassis Suspension:
Front fork overhaul, rear shock absorber service, steering bearing inspection/replacement, wheel bearing service.
Brakes:
Brake system inspection, hydraulic fluid bleeding, brake pad replacement, caliper service, drum brake adjustment (rear).
Bodywork Trim:
Panel removal/installation, seat service, lighting component replacement, cosmetic repairs.
Preventive Maintenance:
Scheduled maintenance checks, oil changes, filter replacements, spark plug checks, drive belt inspection, lubrication points.
Troubleshooting Diagnostics:
Step-by-step diagnostic guides for common starting, running, and electrical issues, fault code interpretation (if applicable).
Repair Rebuild:
Detailed procedures for engine disassembly, cylinder head service, piston/ring replacement, transmission overhaul, carburetor rebuilding.
Adjustments:
Carburetor idle speed/mixture, brake adjustments, throttle cable adjustment, parking brake adjustment.
Depth:
Comprehensive. Covers basic to advanced repairs, including complete engine and transmission rebuilds, electrical system diagnostics, and chassis component overhauls.
Engine Type:
4-stroke, forced air-cooled, SOHC
Displacement:
Approximately 125cc (specific variants may exist, e.g., 121cc for some RIVA models)
Bore X Stroke:
Typical ~52.0mm x 57.9mm (exact may vary by specific RIVA 125 variant)
Compression Ratio:
Likely around 9.0:1 to 10.0:1
Horsepower:
Estimated 8-10 HP at ~6500-7000 RPM (varies by specific model variant and tuning)
Torque:
Estimated 9-11 Nm at ~5000-5500 RPM (varies by specific model variant and tuning)
Carburetor Type:
Mikuni VM or BS series (specific model designation required for exact part number, e.g., VM20/1)
Fuel Tank Capacity:
Approx. 5.0 - 6.0 Liters (varies by specific RIVA 125 variant)
Fuel Type:
Unleaded gasoline, minimum 87 octane
Type:
Automatic Continuously Variable Transmission (CVT)
Drive System:
V-belt drive to rear wheel
Clutch Type:
Centrifugal automatic clutch
Transmission Fluid Spec:
Yamaha Gear Oil (specific viscosity recommended, typically 10W-30 or 20W-40 for final drive if separate)
Overall Length:
Approx. 1800 - 1900 mm (varies by specific RIVA 125 variant)
Overall Width:
Approx. 680 - 700 mm (varies by specific RIVA 125 variant)
Overall Height:
Approx. 1050 - 1100 mm (varies by specific RIVA 125 variant)
Dry Weight:
Approx. 95 - 110 kg (varies by specific RIVA 125 variant)
Curb Weight:
Approx. 100 - 115 kg (varies by specific RIVA 125 variant)
Front Tire Size:
Typically 3.00-10 or 3.50-10
Rear Tire Size:
Typically 3.00-10 or 3.50-10
Wheel Type:
Cast alloy or steel wheels
Crash Safety:
N/A (Scooter segment, not typically subjected to automotive crash testing standards)
Braking System:
Front disc brake, rear drum brake (common configuration). Some variants may have rear drum.
Lighting:
Headlight, taillight, brake light, turn signals.
Mirrors:
Dual rear-view mirrors
Features:
Basic analogue instrumentation (speedometer, odometer, fuel gauge, indicator lights). No advanced infotainment features.
Features:
No electronic driver assistance systems typical of modern vehicles.
Features:
No modern connectivity features (Bluetooth, USB, etc.).
Engine Oil Change:
Every 3,000 km or 3 months, whichever comes first. Refer to manual for precise interval.
Spark Plug Check Replace:
Check every 6,000 km, replace as needed. Typical plug: NGK CR7HSA or equivalent.
Air Filter Cleaning Replacement:
Clean every 6,000 km, replace as needed or every 12,000 km.
Drive Belt Inspection:
Inspect every 6,000 km, replace when worn or damaged (approx. 20,000 km service life typically).
Engine Oil Type:
SAE 10W-30 API SE or SF classification motorcycle oil. Capacity ~0.8-1.0 Liters.
Brake Fluid Type:
DOT 3 or DOT 4 (refer to manual for exact specification for specific model variant)
Carburetor Clogging:
Common issue in older scooters due to fuel degradation or sediment. Requires regular cleaning/rebuilding.
Drive Belt Wear:
Belts can wear over time and snap, leading to loss of power or transmission failure.
Electrical Connections:
Corrosion or loose connections in wiring harness can cause intermittent electrical faults.
Starter Motor Brushes:
Wear on starter motor brushes can lead to failure to start.
Yamaha Legacy:
Yamaha Motor Company is a global leader in motorcycles, scooters, marine products, and musical instruments, known for innovation and quality.
Riva Series:
The RIVA series represented Yamaha's entry and expansion in the scooter market, offering reliable and economical transportation.
Production Period:
Models of this type were produced throughout the 1980s and 1990s, with the 125/Z variant seeing updates and continued production into the early 2000s.
Manufacturing Locations:
Primarily Japan, with potential for assembly in other international locations.
