Yamaha CV80K/Riva 80 1983-1987 Scooter Factory Service Manual
Yamaha Models Covered & Key Technical Specifications
Models: Yamaha CV80K, Riva 80
Sub-models / Variants: Scooter
Trade Names: Riva 80, CV80K
Model Years: 1983–1987
Serial Numbers: CV80K 13T-000101 and later
Technical Data:
- Engine displacement: 79 cc (bore/stroke 49.0 x 42.0 mm)
- Transmission type: V-belt automatic
- Cylinder head bolt torque: 15 Nm (11 ft-lb)
- Drain bolt tightening torque: 20 Nm (14.5 ft-lb)
- Transmission oil capacity: 180 cc (replacement), 200 cc (overhaul)
- Spark plug gap: 0.6–0.7 mm
- Idle speed: 1,350–1,500 r/min
- Battery specific gravity: 1.280 at 20°C (68°F)
- Charging coil resistance: 378 ohms ± 10% (B/R-B)
- Pick-up coil resistance: 34 ohms ± 10% (W/R-B)
- Standard tire pressure: 98.1 kPa (solo rider front), 147 kPa (solo rider rear)
Yamaha Manual Features & Content Preview
- Official 100-page Yamaha OEM publication (P/N LIT-11616-03-63, first edition July 1982) covering the 13T-series build
- Details diagnostic and maintenance procedures for the engine, drivetrain, chassis, and electrical systems of 1983–1987 Yamaha CV80K Riva 80 scooters
- Features 43 exploded-view diagrams and 18 technical specification tables for critical assembly torques and running clearances
- Serves as the base reference for the original dealer launch build, documenting the proprietary 'Vibeless' engine mounting and automatic choke systems
Content Overview
This service documentation outlines the technical architecture of the 13T-series scooter, focusing heavily on the specialized V-belt drive and automatic choke mechanisms unique to this generation. Mechanics will find comprehensive sections on engine overhauls, chassis upkeep, electrical diagnostics, and precise fuel system adjustments.
Periodic maintenance schedules and emission control system notes are integrated directly into the workflow to support long-term engine reliability. The text addresses troubleshooting parameters for common performance issues like power loss and hard starting by supplying exact wear limits for pistons, cylinders, and clutch components. Always ensure proper workshop safety protocols are followed and cross-reference these guidelines with your current tooling before beginning any tear-down.
Specification Previews
Technical data sections provide vital reference values tailored for shop-floor use. Cylinder head bolt torques are documented at 15 Nm. The transmission drain bolt requires 20 Nm. For ignition diagnostics, specific electrical resistance values include 378 ohms for the charging coil and 34 ohms for the pick-up coil. Furthermore, transmission fluid capacity is strictly listed at 180 cc for standard changes and 200 cc following a complete case split.
Keep in mind that while these reference values are crucial for planning, safe mechanical work relies on matching OEM data with professional judgment on the bench.
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