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Yamaha RX 125 Specs

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The Yamaha RX 125 model is a Classic bike manufactured by Yamaha . In this version sold from year 1979 , the dry weight is 96.0 kg (211.6 pounds) and it is equipped with a Single cylinder, two-stroke motor. The engine produces a maximum peak output power of 13.00 HP (9.5 kW) @ 7000 RPM and a maximum torque of 13.34 Nm (1.4 kgf-m or 9.8 ft.lbs) @ 7000 RPM . With this drive-train, the Yamaha RX 125 is capable of reaching a maximum top speed of  . On the topic of chassis characteristics, responsible for road holding, handling behavior and ride comfort, the Yamaha RX 125 has a Painted tubular steel frame with front suspension being Telescopic forks and at the rear, it is equipped with Swing arm twin shocks . Stock tire sizes are 3/0-18 on the front, and 3/0-18 on the rear. As for stopping power, the Yamaha RX 125 braking system includes Single disc size  at the front and Expanding brake (drum brake) size  at the back. 

Yamaha RX 125 General Information

Brand Yamaha 
Model Yamaha RX 125 
Start year 1979 
Year 1979 
Category Classic 
Factory Warranty (Years / miles)

Yamaha RX 125 Dimensions, Aerodynamics and weight

Frame type Painted tubular steel 
Seat details
Wheelbase 1,240 mm (48.8 inches) 
Length 1,915 mm (75.4 inches) 
Width 730 mm (28.7 inches) 
Height 1,060 mm (41.7 inches) 
Seat Height
Alternate Seat Height
Ground Clearance 160 mm (6.3 inches) 
Trail size
Wheels details
Front Tyres - Rims dimensions 3/0-18 
Rear Tyres - Rims dimensions 3/0-18 
Front brakes Single disc 
Rear brakes Expanding brake (drum brake) 
Front Brakes Dimensions - Disc Dimensions
Rear Brakes Dimensions - Disc Dimensions
Curb Weight (including fluids)
Dry Weight 96.0 kg (211.6 pounds) 
Front Percentage of Weight
Rear Percentage of Weight
Weight-Power Output Ratio : 0.1354 HP/kg 
Fuel Tank Capacity 10.00 litres (2.64 gallons) 
Reserve Fuel Capacity
Carrying Details and Capacity
Front Suspension Telescopic forks 
Front Suspension Travel
Rear Suspension Swing arm twin shocks 
Rear Suspension Travel

Yamaha RX 125 Engine and Transmission Technical Data

Engine type - Number of cylinders Single cylinder, two-stroke 
Engine details
Fuel system Carburettor. Mikuni VM24SH 
Engine size - Displacement - Engine capacity 125.00 ccm (7.63 cubic inches) 
Bore x Stroke 56.0 x 50.0 mm (2.2 x 2.0 inches) 
Compression Ratio 6.9:1 
Number of valves per cylinder
Camshaft Valvetrain Configuration Port control 
Maximum power - Output - Horsepower 13.00 HP (9.5 kW) @ 7000 RPM 
Maximum torque 13.34 Nm (1.4 kgf-m or 9.8 ft.lbs) @ 7000 RPM 
Engine Maximum RPM
Cooling system Air 
Lubrication system Autolube 
Engine oil capacity
Exhaust system Single chrome pipe 
Gearbox 5-speed 
Transmission type, final drive ratio Chain 
Clutch type

Yamaha RX 125 Performance

Top Speed
Acceleration 0 to 100 km/h (0 to 62 mph)
Acceleration 0 to 400m (1/4 mile)
Recuperation 60 to 140 km/h in highest gear
Fuel Consumption - MPG - Economy - Efficiency
CO2 emissions

Yamaha RX 125 Electrical Systems, Ignition and Equipment

Ignition Type Magneto 
Electrical Details
Starter Type Kick 
How much horsepower does a Yamaha RX 125 have?
The Yamaha RX 125 has 13.00 HP (9.5 kW) @ 7000 RPM.

How much does a Yamaha RX 125 weighs?
The Yamaha RX 125 weighs 96.0 kg (211.6 pounds).

How many gears does a Yamaha RX 125 have?
The Yamaha RX 125 have 5 gears.