Yamaha RD50

Yamaha RD50 (1973-1981)

SpecificationsRD50 (1973-1981)
EngineAir-cooled 2-stroke single
Displacement49.9 cc (3.05 cu in)
Bore and stroke40 mm (1.57 in) x 39.2 mm (1.54 in)
Compression ratio6.5:1
Power4.5 hp (3.3 kW) at 7,000 rpm
Torque3.8 lb⋅ft (5.2 N⋅m) at 6,000 rpm
CarburetionMikuni VM20
ClutchWet multi-plate
Final driveChain
FrameSingle backbone
SuspensionFront: Telescopic fork, 35 mm (1.4 in) travel
BrakesFront: Drum
WheelsFront: 14 inches
TiresFront: 2.50-14
Seat height29.5 inches (750 mm)
Wheelbase52.8 inches (1,340 mm)
Rake and trail26° / 3.7 inches (94 mm)
Dry weight209 lb (95 kg)
Fuel capacity1.8 US gal (6.8 L)
Oil capacity2.5 US qt (2.4 L)
Gear ratios1st: 2.38
0-60 mph12.5 seconds
Top speed70 mph (113 km/h)
Fuel economy50 mpg (21 kmpl)
Oil Details
Type: SAE 30
Capacity: 2.5 US qt (2.4 L)
Gear Ratios
1st: 2.38
2nd: 1.66
3rd: 1.25
4th: 1.00

Yamaha RD50 motorcycle

The RD50 was a small, lightweight motorcycle that was popular with young people and commuters. It was powered by a 50cc air-cooled engine that produced 4.5 horsepower. The RD50 was a fun and easy-to-ride bike, but it was also slow and lacked power.


Lightweight and easy to ride
Fun and affordable
Reliable and durable

Slow and lacks power
Not a good choice for long-distance riding

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