Yamaha RD Specs

Yamaha RD350B (1974)
Engine: two-stroke air-cooled twin cylinder, reed valve induction, Autolube oil injection, six-speed gearbox
Displacement: 347cc
Bore x stroke: 64 x 54mm
Carburation: two Mikuni VM series 28mm carburettors
Compression ratio: 6.2:1
Max bhp: 39 @ 7500rpm
Max torque: 3.8kgm @ 7000rpm
Ignition system: points, battery and coil
Dry weight: 163kg net
Tyres: 3.00-18 front, 3.50-18 rear
Performance: 103mph

Yamaha RD200
Engine: 195cc
Bore x stroke: 52 x 46mm
Carburettors: two 20mm Keihins
Top speed: approx 85 mph
Wheelbase: 49.5 inches
Seat height: 30.5 inches (disc model 32 inches)
Kerb weight: 288lbs with one gallon fuel (270 lbs for wire-wheeled model)
Fuel capacity: three gallons (two gallons)

Yamaha RD400
Displacement: 398cc
Configuration: air-cooled two-stroke twin with reed valve induction
Bore x stroke: 64.0 x 62.0mm
Compression ratio: 6.2:1
Max bhp: 40hp @ 7000rpm
Max torque: 4.2kg-m @ 6500rpm
Carburettors: 2x 28mm Mikuni
Weight: 165kg (wet)
Tyres: 3.25 x 18 (F) 3.50 x18 (R)
Brakes: 296mm disc( F&R)
Wheelbase: 1344mm (52.9in)

Yamaha RD350LC
Engine: liquid-cooled two-stroke parallel twin
Capacity: 347cc (64 x 54mm)
Valve operation: piston ports; reed inlet valves
Compression ratio: 6.9 to 1 (from exhaust port closure)
Lubrication: injection pump
Ignition: capacitor discharge
Carburation: two 26mm Mikuni carburettors
Peak power: 47bhp at 8500rpm
Peak torque: 28.8ft-lb at 8000rpm
Primary drive: helical gears
Primary ratio: 2.87 to 1 (66/23)
Clutch: wet multiplate
Gearbox: six speed
Frame: tubular steel duplex cradle
Front suspension: telescopic fork, 32mm stanchions
Rear suspension: triangulated swingarm with single spring-damper 5-pos spring preload adjustable
Wheels: cast light alloy, seven spoke
Front tyre: Yokohama 3.00-S18
Rear tyre: Yokohama 3.50-S18
Front brake: twin 265mm hydraulic discs, floating caliper
Rear brake: 180mm drum
Fuel tank: 16.8 litres (3.7 gallons)
Wheelbase: 1360mm (53.5in)
Seat height: 785mm (30.9in)
Weight: 143kg (315lb) dry