Category:
        
        
            Scooter / Moped
        
     
    
        
            Target Audience:
        
        
            Owners and mechanics performing maintenance and repair on the 1985 Yamaha RIVA 80.
        
     
    
    
        
            Competitors 1985:
        
        
            Honda Spree, Elite 80, various other 80cc scooters from brands like Vespa, Suzuki, and Kymco (though Kymco's presence was less prominent in North America at this time).
        
     
    
    
        
            Design Philosophy:
        
        
            Compact, lightweight, user-friendly scooter focused on urban mobility and fuel efficiency.
        
     
    
    
        
            Value Proposition:
        
        
            Provides the critical technical knowledge required to keep the RIVA 80 operating at peak performance and to perform repairs efficiently and correctly.
        
     
 
    
    
    
        
            Engine Mechanical:
        
        
            Detailed disassembly, assembly, inspection, and repair of the engine and its components (cylinder head, piston, crankshaft, connecting rods, camshaft, valves, timing system).
        
     
    
        
            Fuel System Carburetion:
        
        
            Carburetor adjustment, cleaning, overhaul, fuel pump inspection, fuel line routing.
        
     
    
        
            Ignition System:
        
        
            Spark plug specifications, ignition timing, CDI unit testing, stator and pickup coil testing.
        
     
    
        
            Electrical System Charging:
        
        
            Battery maintenance, charging system (stator, regulator/rectifier) testing, starter motor inspection.
        
     
    
        
            Transmission Drive:
        
        
            Automatic transmission operation, fluid type, inspection, and potential service procedures.
        
     
    
        
            Suspension Steering:
        
        
            Front fork service (oil change, seal replacement), rear shock absorber inspection, steering system components.
        
     
    
        
            Braking System:
        
        
            Brake pad/shoe inspection and replacement, brake fluid specifications and bleeding procedures, caliper/drum inspection.
        
     
    
        
            Cooling System:
        
        
            Coolant type and capacity, radiator and fan inspection (if applicable, though RIVA 80 is air-cooled).
        
     
    
        
            Exhaust System:
        
        
            Exhaust pipe and muffler inspection.
        
     
    
        
            Body Panels Trim:
        
        
            Removal and installation of body panels, seat, handlebars, and related trim.
        
     
    
    
        
            Routine Maintenance:
        
        
            Oil changes, filter replacements, spark plug checks, chain lubrication/adjustment (if applicable), battery checks, brake adjustments, tire pressure checks.
        
     
    
        
            Engine Rebuild:
        
        
            Complete engine disassembly, cleaning, measurement of critical wear tolerances, part replacement, and reassembly.
        
     
    
        
            Carburetor Overhaul:
        
        
            Step-by-step instructions for disassembling, cleaning, inspecting, and reassembling the carburetor, including jet sizes and float level adjustments.
        
     
    
        
            Electrical Diagnostics:
        
        
            Troubleshooting steps for starting issues, charging problems, and lighting system malfunctions using wiring diagrams and component tests.
        
     
    
        
            Suspension Service:
        
        
            Fork oil replacement procedures, seal replacement, and general inspection of suspension components.
        
     
    
        
            Brake Bleeding:
        
        
            Correct procedure for bleeding the hydraulic brake system to remove air.
        
     
    
        
            Wheel Bearing Service:
        
        
            Inspection and potential replacement of wheel bearings.
        
     
    
        
            Cable Adjustment:
        
        
            Throttle, brake, and other cable adjustments.
        
     
    
        
            Torque Specifications:
        
        
            Essential torque values for critical fasteners (e.g., cylinder head bolts, crankcase bolts).
        
     
    
    
        
            Depth:
        
        
            Comprehensive, covering everything from basic owner maintenance to in-depth mechanical and electrical repairs. Suitable for both amateur and professional technicians.
        
     
 
    
    
    
        
            Engine Type:
        
        
            2-stroke, air-cooled
        
     
    
    
        
            Bore X Stroke:
        
        
            44.0 mm x 42.0 mm (typical for this displacement)
        
     
    
        
            Compression Ratio:
        
        
            7.1:1 (typical for this era and design)
        
     
    
    
        
            Horsepower:
        
        
            Approximately 5.7 HP @ 7,500 RPM (estimate based on similar models)
        
     
    
        
            Torque:
        
        
            Approximately 0.5 kg-m @ 6,500 RPM (estimate based on similar models)
        
     
    
    
        
            Carburetor Model:
        
        
            Mikuni VM17SH (common for Yamaha models of this size)
        
     
    
        
            Fuel Type:
        
        
            Unleaded gasoline
        
     
    
        
            Fuel Mixture:
        
        
            Pre-mix or Oil Injection (manual will clarify, typically oil injection for this model)
        
     
    
    
        
            Ignition Type:
        
        
            CDI (Capacitor Discharge Ignition)
        
     
    
        
            Spark Plug Type:
        
        
            NGK BPR6HS (common spec, manual will confirm exact part number)
        
     
    
    
        
            Oil Type:
        
        
            2-stroke engine oil (manual will specify viscosity and standard, e.g., API TA or TC)
        
     
    
    
        
            Engine Mounting:
        
        
            Unit Swingarm (engine and transmission integrated with rear suspension swingarm)
        
     
 
    
    
    
        
            Overall Length:
        
        
            Approx. 1,740 mm (68.5 in)
        
     
    
        
            Overall Width:
        
        
            Approx. 650 mm (25.6 in)
        
     
    
        
            Overall Height:
        
        
            Approx. 1,030 mm (40.6 in)
        
     
    
        
            Wheelbase:
        
        
            Approx. 1,210 mm (47.6 in)
        
     
    
    
        
            Dry Weight:
        
        
            Approx. 73 kg (161 lbs)
        
     
    
        
            Gross Vehicle Weight Rating:
        
        
            Manual will specify, typically around 220-250 kg (485-550 lbs) including rider and cargo.
        
     
    
    
        
            Storage:
        
        
            Under-seat storage compartment.
        
     
 
    
    
    
        
            Safety Certification:
        
        
            DOT, EPA, and CARB compliant where applicable (depending on market).
        
     
    
    
        
            Brakes:
        
        
            Front: Drum brake; Rear: Drum brake. Designed for safe and predictable stopping power for its class.
        
     
    
        
            Lighting:
        
        
            Headlight, taillight, brake light, turn signals for visibility.
        
     
    
    
        
            Frame Construction:
        
        
            Steel frame providing a stable and protective structure.
        
     
    
        
            Tires:
        
        
            Tubed tires designed for comfort and stability (manual will specify sizes and recommended pressures).
        
     
 
    
    
    
        
            Oil Change Interval:
        
        
            Every 1,000-2,000 km or 6-12 months (manual will specify exact interval and type of oil).
        
     
    
        
            Spark Plug Check:
        
        
            Every 1,000 km.
        
     
    
        
            Air Filter Cleaning:
        
        
            Every 1,000-2,000 km.
        
     
    
        
            Carburetor Cleaning:
        
        
            As needed, or every 4,000-6,000 km.
        
     
    
        
            Brake System Inspection:
        
        
            Every 2,000 km.
        
     
    
    
        
            Engine Oil Grade:
        
        
            API TC rated 2-stroke oil, viscosity typically SAE 10W-30 (manual must be consulted for exact specification).
        
     
    
        
            Brake Fluid Type:
        
        
            DOT 3 or DOT 4 (manual will specify).
        
     
    
    
        
            Carburetor Clogging:
        
        
            Common in older scooters due to fuel varnish if not used regularly.
        
     
    
        
            Electrical Connector Corrosion:
        
        
            Possible in older vehicles, especially in humid environments.
        
     
    
        
            V-Belt Wear:
        
        
            CVT belts wear over time and can cause slipping or reduced acceleration.
        
     
    
        
            Ignition Coil Failure:
        
        
            Can lead to no spark or weak spark, preventing the engine from running.
        
     
 
    
    
    
        
            Yamaha Motor Corporation:
        
        
            Founded in 1955, Yamaha Motor Corporation is a world-renowned manufacturer of motorcycles, scooters, marine products, and musical instruments, known for its engineering excellence and performance.
        
     
    
    
        
            Riva Series:
        
        
            The RIVA series represented Yamaha's entry and expansion into the scooter market, offering practical and stylish urban transportation. The RIVA 80 was a key model in this line.
        
     
    
    
        
            Production Years:
        
        
            The RIVA 80 was produced through the mid-to-late 1980s.
        
     
    
        
            Manufacturing Location:
        
        
            Primarily manufactured in Japan.