Naked Motorcycles
1990Yamaha RX 100
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The 1990 Yamaha RX 100 is a lightweight 100cc two-stroke designed for entry-level and budget-conscious riders seeking reliable everyday transportation. Known for its simplicity, fuel efficiency, and nimble handling, it excels in urban commuting and casual riding. With 11.5 horsepower and a top speed of 125 km/h, it offers practical performance for novice motorcyclists.
- Capacity
- 100.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 4-speed
- Dry weight
- 99.0 kg
- Seat height
- 750 mm
- Power
- 11.5 HP (8.5 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built primarily as a lightweight commuter and city runabout rather than a performance or adventure machine.
- Built for
- A nostalgic, buzzy two-stroke single that rewards revving and nimble handling over outright speed.
- Not ideal for
- Not suited to highway touring, two-up comfort, or off-road use given its drum brakes, small tank, and modest power.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usEngine
- Capacity
- 100.0 ccm
- Power
- 11.5 HP (8.5 kW)
- CO2 Emissions
- 58 CO2 g/km
- Torque
- 8.6 Nm (0.9 kgf-m) @ 6500 RPM
- Engine type
- Single, two-stroke
- Fuel consumption
- 2.50 litres/100 km (40.0 km/l)
- Power/weight ratio
- 0.1162 HP/kg (dry)
- Bore x stroke
- 50.0 x 50.0 mm
- Compression
- 10.1:1
- Cooling system
- Air
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- CDI
- Valves per cylinder
- 2
- Lubrication system
- Autolube
Transmission
- Gearbox
- 4-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- 74 tooth clutch housing bell
Performance
- Top speed
- 125.0 km/h (77.7 mph)
Dimensions & weight
- Overall width
- 740 mm
- Seat height
- 750 mm
- Dry weight
- 99.0 kg
- Fuel capacity
- 10.50 litres
Chassis & suspension
- Frame
- Double cradle frame
- Front suspension
- Telescopic oil damped
- Rear suspension
- Coil spring oil damped
Brakes & wheels
- Front brakes
- Expanding brake (drum brake)
- Rear brakes
- Expanding brake (drum brake)
- Front tyre
- 2/18-4PR
- Rear tyre
- 3/18-4PR
Other
- Color options
- red, black, blue, silver
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
Rider Reviews
Common questions
What is the engine size of the Yamaha RX 100?
The 1990 Yamaha RX 100 has a Capacity of 100.0 ccm (6.10 cubic inches).
What engine power does the Yamaha RX 100 have?
The 1990 Yamaha RX 100 has a Power of 11.5 HP (8.5 kW).
How many gears does the Yamaha RX 100 have?
The 1990 Yamaha RX 100 has a Gearbox of 4-speed.
What is the torque of the Yamaha RX 100?
The 1990 Yamaha RX 100 has a Torque of 8.6 Nm (0.9 kgf-m or 6.3 ft.lbs) @ 6500 RPM.
How much does the Yamaha RX 100 weigh?
The 1990 Yamaha RX 100 has a Dry weight of 99.0 kg (218.3 pounds).
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