Era:
The 1973 RD-350 was a groundbreaking sportbike for its era, known for its powerful two-stroke parallel-twin engine and agile handling, establishing Yamaha's reputation in the performance motorcycle market.
Competitors:
Competed against other performance-oriented motorcycles of the early 1970s, such as Kawasaki's H1 Mach III and Suzuki's T500 Titan, offering a strong blend of speed and maneuverability.
Features:
High-performance two-stroke engine, reed valve induction, disc front brake (on many later models), distinctive 'Aero-tank' styling, excellent power-to-weight ratio.
Value Proposition:
Provides essential manufacturer-authorized information for owners and mechanics to maintain, diagnose, and repair this iconic sportbike, ensuring optimal performance and longevity.
Coverage:
Comprehensive service and repair for 1973 Yamaha RD-350
Estimated Pages:
Varies by specific print run, typically 100-250 pages for this era's service manuals.
Type:
Parts List / Service and Repair Manual
Operating Systems:
Suitable for Windows XP, Vista, 7, and Mac operating systems.
Guarantee:
100% satisfaction guaranteed.
Virus Free:
100% Virus Free.
Engine:
Engine assembly, disassembly, tuning, lubrication, cooling, ignition system, fuel system (carburetors).
Transmission:
Gearbox inspection, repair, maintenance, lubrication, clutch system.
Chassis:
Frame, suspension (front forks, rear shocks), steering, wheels, tires, brakes (front and rear drums/discs).
Electrical:
Wiring diagrams, lighting, ignition coils, battery, charging system, switches.
Bodywork:
Fuel tank, seat, fenders, side covers, handlebars, levers, cables.
Maintenance:
Regular servicing, lubrication points, filter replacement, spark plug checks, chain adjustment.
Repair:
Detailed step-by-step instructions for engine rebuilds, transmission overhauls, brake system repairs, suspension servicing.
Troubleshooting:
Diagnostic guides for common problems, performance issues, electrical faults.
Parts Identification:
Exploded diagrams with part numbers for all major assemblies and components.
Depth:
In-depth coverage suitable for dealership mechanics, including specifications, tolerances, and torque values for professional repairs and full restorations.
Searchability:
Likely text-searchable if OCR processed, allowing quick finding of information.
Printable:
Yes, individual pages or the entire manual can be printed.
Binding Type:
Not applicable (digital PDF)
Paper Type:
Not applicable (digital PDF)
Engine Type:
Air-cooled, two-stroke, parallel-twin
Displacement:
347 cc (21.2 cu in)
Bore X Stroke:
43.0 mm x 60.0 mm (approximate, verify with manual)
Induction:
Reed valve, typically dual Mikuni VM carburetors (e.g., 26mm or 28mm).
Compression Ratio:
Approximately 7.4:1 (verify with manual)
Horsepower:
Around 33-35 hp at 7,500 rpm (verify with manual)
Torque:
Around 24-26 lb-ft at 6,000 rpm (verify with manual)
Fuel Type:
Leaded gasoline with appropriate 2-stroke oil mixture (e.g., 20:1 or 25:1, check manual for specific ratio and oil type).
Lubrication System:
Premix or Autolube oil injection system (depending on specific market variant).
Transmission Type:
Constant-mesh 5-speed manual
Optional Transmission:
N/A
Clutch Type:
Wet, multiple disc clutch, cable operated.
Gear Ratios:
Specific gear ratios are detailed in the manual, crucial for performance tuning.
Final Drive:
O-ring sealed chain drive.
Overall Length:
Approx. 2,100 mm (verify with manual)
Overall Width:
Approx. 750 mm (verify with manual)
Wheelbase:
Approx. 1,340 mm (verify with manual)
Dry Weight:
Approx. 140-145 kg (verify with manual)
Fuel Capacity:
Approx. 16 liters (verify with manual)
Safety Features Era:
Basic for its time; focused on handling and braking capabilities. No formal crash ratings as with modern vehicles.
Braking System:
Front: Disc brake (on later models/variations), Rear: Drum brake. Specifications and servicing procedures are detailed in the manual.
Suspension:
Front: Telescopic forks with adjustable pre-load. Rear: Swingarm with dual shock absorbers. Tuning and service are covered.
Lighting:
Halogen headlight, taillight, brake light, turn signals. Wiring diagrams are critical.
Infotainment System:
N/A (basic analog instrumentation: speedometer, tachometer, indicator lights).
Driver Assistance Features:
N/A
Connectivity Features:
N/A
Reed Valve Induction:
A key technological feature of the RD-350, improving power delivery and efficiency over piston-ported designs.
Oil Change:
Frequent oil changes for the gearbox are critical. Check manual for specific mileage intervals and oil type (e.g., SAE 80W/90 GL-4 gear oil).
Spark Plugs:
Regular inspection and gap adjustment (e.g., every 2,000-3,000 miles). Recommended plug types and gaps are in the manual (e.g., NGK B8ES/ES).
Carburetor Cleaning:
Recommended periodically, especially if fuel has been sitting, or performance degrades. Manual details disassembly and cleaning procedures.
Chain Maintenance:
Regular cleaning, lubrication, and tension adjustment is essential for drivetrain longevity. Check manual for procedure and spec (e.g., 20-30mm slack).
Gearbox Oil:
Yamalube Gear Oil 80W/90 or equivalent GL-4 spec oil. Capacity is typically around 1.2-1.5 liters.
2 Stroke Oil:
High-quality 2-stroke motorcycle oil, mixed at the ratio specified in the manual (e.g., 20:1, 25:1).
2 Stroke Wear:
Piston ring and cylinder wear are common due to the nature of 2-stroke engines. Proper pre-mix and regular maintenance are key.
Reed Valves:
Reed valve petals can chip or break, affecting performance. Manual covers inspection and replacement.
Carburetor Sync:
Carburetors may need periodic synchronization for optimal running. Manual provides the procedure.
Electrical Gremlins:
Older wiring can degrade. Comprehensive wiring diagrams in the manual are essential for troubleshooting.
Yamaha Motorcycles:
Yamaha has a long history of performance and innovation in motorcycles, starting with their early two-strokes and evolving into a global leader across all categories.
Rd Series:
The RD-350 was part of Yamaha's highly successful RD (Race Development) series, which focused on high-performance, two-stroke technology, leading to models like the RD-400 and further innovations.
Production Period:
Early 1970s. The 1973 model represents one of the earliest iterations of the successful RD-350 platform.
Motorcycle Icon:
The Yamaha RD-350 is widely recognized as a 'modern classic' and an iconic sportbike that significantly influenced motorcycle design and performance.
Performance Reviews:
Contemporary reviews praised its acceleration, handling, and distinctive two-stroke sound. The manual helps maintain this performance.
Manufacturer Backed:
This manual is written by the manufacturer and used by dealership mechanics, indicating its authenticity and official status.
