Engineered by Yamaha for the allround motorcycle segment, the 1990 Yamaha RX 100 utilizes a 100 cc (6.1 cu in) air-cooled single cylinder, two-stroke layout. In factory specification, peak output is rated at 11.5 HP (8.4 kW) at 7,500 rpm while maximum torque reaches 8.6 Nm (6.3 lb-ft) at 6,500 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 115 HP per liter and a 1,000 rpm working window between peak torque (6,500 rpm) and peak power (7,500 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the RX 100 measures 99 kg (218 lbs) dry, translating to a power-to-weight ratio of 0.12 HP/kg (8.61 kg per horsepower). Rider ergonomics and chassis geometry center around a 750 mm (29.5 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1 mm (0 in) wheelbase engineered for quick, flickable steering geometry. The 10.5-liter (2.8 US gal) fuel tank paired with a rated consumption of 2.5 L/100 km provides an estimated theoretical range of roughly 420 km (261 miles) between fill-ups, while factory top speed is listed at 125 km/h (78 mph).
Specific Output
115 HP/L
Power-to-Weight
0.12 HP/kg (8.61 kg/HP)
Power Band Window
6,500–7,500 rpm
Theoretical Range
~420 km (261 mi)
Engine
Displacement100.0 ccm (6.10 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power11.5 HP (8.4 kW)) @ 7500 RPM
Torque8.6 Nm (0.9 kgf-m or 6.3 ft.lbs) @ 6500 RPM
Compression10.1:1
Bore x Stroke50.0 x 50.0 mm (2.0 x 2.0 inches)
Valves/Cylinder2
Fuel SystemCarburettor. Mikuni RM 18 mm
Fuel ControlSingle Overhead Cams (SOHC)
IgnitionCDI
LubricationAutolube
CoolingAir
Max RPM5800
Transmission
Gearbox4-speed
Final DriveChain (final drive)
Clutch74 tooth clutch housing bell
Performance
Top Speed125.0 km/h (77.7 mph)
0-100 km/h19.50 seconds
Fuel Consumption2.50 litres/100 km (40.0 km/l or 94.09 mpg)
Greenhouse Gases58.0 CO2 g/km. (CO2 - Carbon dioxide emission)
ExhaustSingle stainless steel pipe
Chassis
Frame TypeDouble cradle frame
Front SuspensionTelescopic oil damped
Rear SuspensionCoil spring oil damped
Wheelbase1 mm (0.0 inches)
Wheels & Brakes
Front Tyre2.50-R18
Rear Tyre3.00-R18
Front BrakesExpanding brake (drum brake)
Rear BrakesExpanding brake (drum brake)
Dimensions & Weight
Dry Weight99.0 kg (218.3 pounds)
Power/Weight0.1162 HP/kg
Seat Height750 mm (29.5 inches) If adjustable, lowest setting.
Overall Height1 mm (0.0 inches)
Overall Length2040 mm (80.3 inches)
Overall Width740 mm (29.1 inches)
Fuel Capacity10.50 litres (2.77 US gallons)
Other
StarterKick
Color OptionsRed, black, blue, silver
Notes
It is a living legend in India even in 4s era.Rules the road for speed stability being a 100cc only.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
