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Yamaha R5C 1972 1973 Factory Service Repair Manual PDF Download
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Basic Information Identification Make: Yamaha Model: R5C Year: 1973 Introduction Market Position Positioning: The Yamaha R5C was a significant model in Yamaha's sport motorcycle lineage, bridging the gap between earlier...
Taper: Motorcycles
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UGS: 51911
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| Basic Information | |
| Identification | |
| Make: | Yamaha |
| Model: | R5C |
| Year: | 1973 |
| Introduction | |
| Market Position | |
| Positioning: | The Yamaha R5C was a significant model in Yamaha's sport motorcycle lineage, bridging the gap between earlier models and the iconic RD series. It was positioned as an accessible yet performance-oriented twin-cylinder two-stroke. |
| Competitive Analysis | |
| Competitors: | Competed against models like the Kawasaki H1 Mach III, Suzuki T500 Titan, and Honda CB350/CB400 Four, offering a unique blend of handling and torque characteristics. |
| Key Features | |
| Features: | Parallel-twin two-stroke engine, reed valve induction, disc front brake, lightweight chassis, sporty styling. |
| Manual Details | |
| Coverage Areas | |
| Coverage: | Complete Factory Service Repair Manual |
| Page Count | |
| Pages: | Hundreds (exact count not specified, but implied extensive) |
| Manual Type | |
| Type: | Factory Service Repair Manual |
| Language | |
| Language: | English |
| Format | |
| Format: | PDF Download |
| Manual Coverage | |
| Systems Covered | |
| Engine: | Complete engine overhaul, tuning, carburetor, ignition, lubrication, cooling |
| Transmission: | Gearbox disassembly, assembly, inspection, lubrication |
| Frame And Suspension: | Frame inspection and repair, front forks, rear shock absorbers, swingarm, steering |
| Brakes: | Front and rear brake system maintenance, adjustment, component replacement |
| Electrical System: | Wiring diagrams, lighting, ignition system, charging system, battery |
| Fuel System: | Fuel tank, fuel lines, petcock, carburetor service |
| Exhaust System: | Exhaust pipes, mufflers, mounting |
| Wheels And Tires: | Wheel removal, installation, tire replacement, spoke adjustment |
| Bodywork And Trim: | Fenders, fuel tank, seat, handlebars, controls, emblems |
| Procedures Included | |
| Maintenance: | Regular scheduled maintenance, fluid changes, filter replacements, chain adjustment |
| Troubleshooting: | Diagnostic procedures for common and uncommon faults, symptom analysis |
| Repair: | Detailed step-by-step repair instructions for all major components and systems |
| Overhaul: | Complete engine and transmission rebuild procedures |
| Adjustment: | Carburetor synchronization, ignition timing, clutch and brake adjustments |
| Inspection: | Component wear assessment, safety checks |
| Technical Depth | |
| Depth: | Comprehensive, from basic adjustments to complete engine rebuilds and electrical system diagnostics |
| Manual Specifications | |
| File Format | |
| Format: | |
| Print Quality | |
| Quality: | High-resolution, printable pages |
| Binding Type | |
| Binding: | Digital (downloadable, printable) |
| Paper Type | |
| Paper: | N/A (digital format) |
| Engine Specifications | |
| Primary Engine | |
| Type: | Air-cooled, two-stroke, parallel-twin |
| Displacement: | 347 cc (approximate, depending on specific R5C variant) |
| Bore X Stroke: | 54.0 mm x 74.0 mm (typical for R5 series) |
| Compression Ratio: | 6.6:1 (typical) |
| Induction: | Reed valve induction |
| Performance | |
| Horsepower: | Approximately 33 hp @ 7,000 rpm (estimated) |
| Torque: | Approximately 26 lb-ft @ 6,000 rpm (estimated) |
| Fuel System | |
| Carburetors: | Dual Mikuni VM30SC (or similar 30mm units) |
| Fuel Type: | Unleaded gasoline (pre-mix oil required) |
| Lubrication | |
| System: | Autolube (separate oil injection) and premix backup |
| Ignition | |
| System: | Contact breaker points, CDI ignition (later models/upgrades) |
| Engine Numbers | |
| Identification: | Engine number typically found on the crankcase near the transmission. |
| Transmission | |
| Standard | |
| Type: | 5-speed constant mesh |
| Optional | |
| Optional Gearbox: | N/A (standard 5-speed) |
| Features | |
| Clutch: | Wet, multi-plate |
| Final Drive: | Chain drive |
| Fluid Specifications | |
| Gearbox Oil: | Yamalube 2-stroke oil or equivalent SAE 20W API API-GL4 (check manual for exact spec). |
| Dimensions | |
| Exterior | |
| Length: | Approx. 81.5 in (2070 mm) |
| Width: | Approx. 30.7 in (780 mm) |
| Height: | Approx. 43.7 in (1110 mm) |
| Wheelbase: | Approx. 53.7 in (1365 mm) |
| Weights | |
| Dry Weight: | Approx. 357 lbs (162 kg) |
| Wet Weight: | Approx. 384 lbs (174 kg) |
| Fuel Capacity | |
| Tank Capacity: | Approx. 4.2 US gallons (16 liters) |
| Tire Sizes | |
| Front Tire: | 3.00-18 4PR (typical) |
| Rear Tire: | 3.50-18 4PR (typical) |
| Wheelbase | |
| Wheel Pattern: | Spoked wheels |
| Safety Features | |
| Ratings | |
| Safety Ratings: | N/A (vintage motorcycle, safety standards were different) |
| Active Features | |
| Front Brake: | Single Disc Brake |
| Rear Brake: | Drum Brake |
| Passive Features | |
| Lighting: | Halogen Headlight, Taillight, Turn Signals |
| Technology Features | |
| Infotainment | |
| Features: | N/A (no electronic infotainment features) |
| Driver Assistance | |
| Features: | N/A (no electronic driver assistance features) |
| Connectivity | |
| Features: | N/A (no electronic connectivity features) |
| Performance Tech | |
| Induction Type: | Reed valve induction for improved low-end torque and throttle response compared to piston port designs. |
| Brakes: | Introduction of a front disc brake was a significant advancement for improved stopping power over drum brakes. |
| Maintenance | |
| Service Intervals | |
| Oil Change: | Check Autolube system regularly; gearbox oil change every 3,000-6,000 miles or annually. |
| Spark Plugs: | Inspect and clean/replace every 1,500-3,000 miles. |
| Chain Adjustment: | Check and adjust chain slack every 500 miles or as needed. |
| Carburetor Cleaning: | Recommended annually or if performance issues arise. |
| Air Filter: | Clean/replace every 3,000 miles or as per manual recommendation. |
| Fluid Specifications | |
| 2 Stroke Oil: | Yamalube 2-stroke oil or equivalent JASO FD/FC rated oil. |
| Brake Fluid: | DOT 3 or DOT 4 (for disc brake caliper, check manual for specific type and replacement interval). |
| Known Issues | |
| Ignition Systems: | Points ignition can be finicky; CDI upgrades are common. Worn points can cause misfires. |
| Carburetors: | VM30 carburetors can be prone to wear and require precise tuning. Diaphragm issues can cause poor performance. |
| Autolube System: | Oil pump drive or pump itself can fail, leading to engine seizure if not maintained. Always ensure oil reservoir is filled. |
| Engine Sealing: | Like many vintage two-strokes, crank seals can degrade over time, leading to air leaks and running issues. |
| Clutch: | Clutch plates can wear out, requiring replacement. Clutch adjustment is critical for smooth engagement. |
| Part Numbers | |
| Common Parts: | Manual will contain specific part numbers for engine components, seals, gaskets, electrical parts, etc. |
| Vehicle History | |
| Brand Heritage | |
| Heritage: | Yamaha has a rich history in motorcycle manufacturing, known for innovation and performance, particularly in the two-stroke era. |
| Model Evolution | |
| Predecessors: | Evolved from earlier Yamaha parallel-twin models like the YDS series. |
| Successors: | Directly led to the highly successful Yamaha RD series (RD250, RD350, RD400). |
| Production | |
| Production Years: | 1972-1973 (for R5C variant) |
| Manufacturing Location: | Japan |
| Awards & Recognition | |
| Recognitions | |
| Industry Recognition: | While specific awards are not documented for the R5C itself, it was recognized as a capable and enjoyable sport motorcycle of its era, laying the groundwork for the RD series' success. |
| Ratings | |
| Performance Ratings: | Generally well-received by motorcycle press for its performance and handling characteristics relative to its class and price point. |