Segment:
Compact scooter, positioned for urban commuting and recreational use.
Competitors:
Competed against other 125cc-200cc class scooters from brands like Honda (e.g., Helix), Kymco, and Suzuki.
Design:
Step-through frame design for easy mounting and dismounting, comfortable seating, enclosed bodywork for weather protection.
Powertrain:
Reliable air-cooled engine with automatic transmission for ease of operation.
Audience:
Beginner riders, commuters, and those seeking an economical and practical two-wheeled vehicle.
Engine:
Engine assembly, disassembly, tuning, diagnostics, top-end and bottom-end components
Fuel System:
Carburetor service, fuel tank, fuel lines, fuel pump (if applicable)
Ignition System:
Ignition coil, CDI unit, spark plug, timing
Transmission:
Automatic transmission operation, maintenance, internal components
Drivetrain:
Final drive, belt drive system (if applicable), drive pulleys
Suspension:
Front fork assembly, rear shock absorber, linkage maintenance
Brakes:
Front and rear brake systems, hydraulic lines, brake pads, master cylinders, calipers
Electrical System:
Wiring diagrams, battery, starter motor, alternator, lighting, switches, fuses
Bodywork And Frame:
Frame inspection, body panel removal and installation, seating, fairings
Cooling System:
Coolant specifications, radiator, fan (if applicable)
Exhaust System:
Muffler, exhaust pipes, gaskets
Maintenance:
Oil changes, filter replacements, spark plug service, chain/belt adjustment, brake fluid replacement, coolant checks
Troubleshooting:
Diagnostic charts, common problem identification and solutions
Repair:
Component disassembly, reassembly, part replacement, internal engine work, transmission overhaul
Adjustment:
Carburetor adjustment, throttle cable, brake levers, suspension settings
Specifications:
Torque values, clearances, fluid capacities, electrical component testing parameters
Depth:
Full factory-level detail, covering everything from basic maintenance to complete engine and transmission rebuilds.
Quality:
High-resolution, suitable for printing individual pages or the entire manual.
Type:
Digital (N/A for PDF download)
Type:
Digital (N/A for PDF download)
Text Search:
Searchable text within the PDF for quick information retrieval.
Expiry:
No expiry dates, perpetual access.
Extra Fees:
No extra fees, single purchase.
Type:
Four-stroke, air-cooled, SOHC
Displacement:
180cc (approximate, based on model designation)
Bore X Stroke:
Specifics available in manual
Compression Ratio:
Specifics available in manual
Horsepower:
Estimated 15-18 HP (actual figures vary)
Torque:
Specifics available in manual
Carburetor:
Single Mikuni carburetor (specific model number in manual)
Fuel Type:
Unleaded gasoline
Oil Type:
Yamalube or equivalent SAE 10W-40 API SE, SF, or SG motorcycle oil (specific grade in manual)
Oil Capacity:
Approximately 1.5 - 1.8 Liters (check manual for exact figure)
Type:
Automatic (CVT - Continuously Variable Transmission)
Drive System:
V-belt automatic transmission with torque converter
Gear Ratios:
Variable, managed by CVT. Specific ratios for drive/driven pulleys in manual.
Type:
Yamaha ATF Type 1 or equivalent automatic transmission fluid (check manual for exact specification)
Capacity:
Specific capacity for transmission fluid (check manual)
Length:
Approx. 2000 mm (Varies by model year/variant)
Width:
Approx. 750 mm (Varies by model year/variant)
Height:
Approx. 1150 mm (Varies by model year/variant)
Wheelbase:
Approx. 1400 mm (Varies by model year/variant)
Dry Weight:
Approx. 140-150 kg (Varies by model year/variant)
Curb Weight:
Specifics in manual
Front Tire Size:
e.g., 110/90-13 (Specifics in manual)
Rear Tire Size:
e.g., 130/70-13 (Specifics in manual)
Bolt Pattern:
N/A for scooter (hub mounted)
Crash Safety:
N/A (Motorcycle safety ratings differ from automotive)
Braking:
Disc front, drum rear (typical for the era). Specific brake fluid in manual.
Lighting:
Headlight, taillight, brake light, turn signals
Frame Construction:
Steel tube frame
Mirrors:
Handlebar-mounted rear-view mirrors
Engine Oil Change:
Every 3,000 km or 6 months (typical for the era, refer to manual for exact)
Spark Plug Service:
Inspect every 6,000 km, replace as needed (refer to manual for type and gap)
Air Filter Cleaning:
Clean every 6,000 km, replace as needed
Transmission Fluid Change:
Every 12,000 km or 12 months (typical, check manual)
Brake Fluid Replacement:
Every 24,000 km or 24 months (typical, check manual for type)
Engine Oil:
SAE 10W-40 API SE, SF, or SG
Transmission Fluid:
Yamaha ATF Type 1 or equivalent
Brake Fluid:
DOT 3 or DOT 4 (check manual for confirmation)
Coolant:
Ethylene glycol-based coolant, 50/50 mixture with distilled water (if liquid-cooled, check manual)
Common Problems:
Potential for carburetor gumming if not run regularly, CVT belt wear over time, aging electrical components (e.g., stator, regulator rectifier). Detailed diagnostics in manual.
Engine Mounts:
Specific torque values provided in manual
Wheel Nuts:
N/A for scooter (hub mounted)
Manufacturer:
Yamaha Motor Corporation, a Japanese manufacturer renowned for motorcycles, musical instruments, and marine products.
Development:
The Riva series was Yamaha's entry into the larger displacement scooter market, offering more power and comfort than smaller models.
Manufacturing Location:
Likely manufactured in Japan or potentially at one of Yamaha's international facilities.
Production Run:
Produced from 1987 through 1991, representing a specific generation of Yamaha scooters.
