🏷️ Basic Information

Make:

Yamaha

Model:

RD350

Year:

1973

Product Type:

Parts List

👋 Introduction

Market Position:

The Yamaha RD350 (internally designated 347) was a pivotal model in the development of performance-oriented two-stroke motorcycles, offering a blend of power, handling, and affordability that captured the burgeoning sportbike market of the era.

Competitive Analysis:

Competed against similar capacity two-strokes from brands like Kawasaki (H series) and Suzuki (GT series), but the RD350's 'Race Developed' ethos and potent twin-cylinder engine set it apart.

Key Features:

Torquey 350cc parallel-twin, reed-valve induction, six-speed transmission, distinctive performance-oriented chassis, and a legendary reputation for acceleration and handling.

📋 Manual Details

Coverage Areas:

Comprehensive parts identification for all major assemblies and components of the 1973 Yamaha RD350 motorcycle.

Part Number Format:

Official Yamaha part numbers (e.g., 1A0-xxxxxx-xx) are provided for each component.

Page Count:

Estimated 100-150 pages (typical for period parts catalogs).

Manual Type:

Parts Catalog

Language:

English

Format:

Printed

📖 Manual Coverage

Systems Covered:

Engine, Chassis, Fuel System, Ignition System, Electrical System, Braking System, Suspension, Wheels, Controls, Bodywork, and Accessories.

Systems Covered Detail:

Includes detailed illustrations and part numbers for: Engine (cylinder block, pistons, crankshaft, connecting rods, reed valves, lubrication system), Transmission (gearbox internals, clutch assembly), Fuel System (carburetors, fuel tank, petcock), Ignition System (generator, CDI unit, coils, spark plugs), Electrical System (wiring harness, lights, horn, switches), Chassis (frame, swingarm, steering head), Suspension (front forks, rear shocks), Brakes (front and rear brake assemblies, linkages), Wheels (rims, spokes, hubs, tires), Controls (handlebar, levers, cables, footpegs), Bodywork (fenders, fuel tank cover, side panels, seat), and Accessories.

Procedures Included:

Component identification via detailed exploded diagrams, part number referencing, and assembly overviews. Does not include repair procedures or maintenance schedules.

Usage Guidance:

Essential for identifying correct replacement parts during restoration or repair. Users can cross-reference worn or damaged components with the detailed diagrams and assigned part numbers.

Technical Depth:

Component-level identification with official Yamaha part numbers, crucial for sourcing and verifying correct replacements.

📊 Manual Specifications

File Format:

N/A (Print)

Digital Format Options:

If offered digitally, it would typically be a PDF with searchable text for part numbers and descriptions. High-resolution scans are preferred for clarity of diagrams.

Print Quality:

Professional, typically black and white line drawings and text. Quality may vary based on original printing and condition of the catalog.

Binding Type:

Stapled or Perfect Bound (common for period manuals).

Paper Type:

Durable paper stock, often newsprint or semi-gloss, designed for workshop use.

⚙️ Engine Specifications

Engine Type:

Two-stroke, parallel-twin, air-cooled

Displacement:

347 cc (21.2 cu in)

Bore X Stroke:

43.0 mm x 64.0 mm (1.69 in x 2.52 in)

Compression Ratio:

6.2:1

Induction:

Reed valve induction

Power Output:

Approximately 33 hp (24.6 kW) at 7,500 rpm (est.)

Torque:

Approximately 22 lb-ft (30 Nm) at 7,000 rpm (est.)

Ignition Timing:

Specific timing (e.g., 1.5 mm BTDC) would be detailed in a service manual. CDI ignition system for reliable spark.

Cooling System:

Air-cooled

0-60 Mph Time:

Under 7 seconds (typical for the era)

Top Speed:

Approximately 100 mph (160 km/h) (est.)

Carburetor Type:

Dual Mikuni VM30SC 30mm constant velocity carburetors

Fuel Tank Capacity:

16 Liters (4.2 US gal)

Fuel Type:

Unleaded gasoline with a 2-stroke oil mix (typically 20:1 or 25:1 depending on oil and riding conditions)

🔧 Transmission

Transmission Type:

Constant mesh, 6-speed sequential return

Clutch Type:

Wet, multi-plate

Final Drive:

Chain drive

Gear Ratios:

Specific ratios would be detailed in a service manual, but the 6-speed gearbox provided a wide range for performance.

Transmission Oil Spec:

Yamaha Gear Oil or equivalent SAE 80W API GL-4 (consult specific service manual for exact Yamaha specification)

📐 Dimensions

Overall Length:

2055 mm (80.9 in)

Overall Width:

770 mm (30.3 in)

Overall Height:

1075 mm (42.3 in)

Wheelbase:

1370 mm (53.9 in)

Dry Weight:

157 kg (346 lbs)

Wet Weight:

Approximately 170 kg (375 lbs) (est. with fluids)

Weight Distribution:

Performance-oriented bias, favoring front stability during acceleration and cornering.

🛡️ Safety Features

Safety Ratings:

N/A (Motorcycle safety ratings were not standardized as they are today).

Active Features:

Dual leading-shoe front drum brake, single leading-shoe rear drum brake, balanced chassis for stable handling.

Passive Features:

Robust frame construction, rider ergonomics designed for control.

💡 Technology Features

Infotainment System:

N/A (Basic motorcycle technology of the era).

Driver Assistance Features:

N/A

Connectivity Options:

N/A

🔧 Maintenance

Service Intervals:

Regular checks of spark plugs, chain tension, brake operation, and oil levels are critical. Engine top-end rebuilds are generally required at higher mileage intervals (e.g., 15,000-25,000 miles depending on usage and maintenance).

Carburetor Jetting Considerations:

Jetting can vary based on altitude, exhaust modifications, and air filter changes. This parts list does not detail jetting, but part numbers for jets and needles are present.

Engine Oil Type:

High-quality 2-stroke oil, specifically formulated for air-cooled engines (e.g., Yamalube 2R or equivalent, mixed with gasoline at 20:1 or 25:1 ratio).

Transmission Oil Capacity:

Approximately 0.8 Liters (0.85 US qt)

Fork Oil Type:

Yamaha Fork Oil or equivalent SAE 10W (capacity typically 140cc per leg).

Known Issues:

Common issues include wear on reed petals, carbon buildup in exhaust ports, clutch slippage if not maintained, and potential gearbox wear if not properly lubricated. Crankshaft seals can also degrade over time.

Spark Plug Recommendation:

NGK B8ES or equivalent (gap typically 0.7-0.8mm)

Carburetor Maintenance:

Regular cleaning and adjustment of Mikuni VM30 carbs are essential for optimal performance and fuel economy.

📚 Vehicle History

Brand Heritage:

Yamaha Motor Company, founded in 1955, quickly established a reputation for innovation and performance in motorcycles, building on its musical instrument manufacturing legacy.

Model Evolution:

The RD350 was a significant evolution of Yamaha's 'R' series, building on the success of the earlier 250cc models. It introduced a larger displacement and further refined the two-stroke performance formula, setting the stage for later iconic models like the RD400.

Production Years:

1973-1975 (RD350, before the RD400)

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions:

Widely recognized in motorcycle enthusiast communities as a classic sportbike and a legendary two-stroke icon, often praised for its accessible performance and tuning potential.

Ratings:

Highly rated by contemporary motorcycle publications for its performance-to-price ratio and exhilarating riding experience.