Built around Csc's allround motorcycle platform, the 2021 Csc Motorcycles RX4 relies on a 450.3 cc (27.5 cu in) liquid-cooled single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 40.2 HP (29.3 kW) at 8,000 rpm while maximum torque reaches 37 Nm (27.3 lb-ft) at 7,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 89.3 HP per liter and a 1,000 rpm working window between peak torque (7,000 rpm) and peak power (8,000 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the Motorcycles RX4 measures 203.1 kg (448 lbs) dry, translating to a power-to-weight ratio of 0.2 HP/kg (5.05 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,425 mm (56.1 in) wheelbase engineered for balanced agility and highway composure. The 20.06-liter (5.3 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 157 km/h (97 mph).
Specific Output
89.3 HP/L
Power-to-Weight
0.2 HP/kg (5.05 kg/HP)
Power Band Window
7,000–8,000 rpm
Engine
Displacement450.3 ccm (27.48 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power40.2 HP (29.3 kW)) @ 8000 RPM
Torque37.0 Nm (3.8 kgf-m or 27.3 ft.lbs) @ 7000 RPM
Compression11.0:1
Bore x Stroke94.5 x 64.0 mm (3.7 x 2.5 inches)
Valves/Cylinder4
Fuel SystemInjection. Delphi
Fuel ControlSingle Overhead Cams (SOHC)
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
Performance
Top Speed156.9 km/h (97.5 mph)
ExhaustStainless steel twin pipe
Chassis
Front SuspensionInverted forks
Rear SuspensionAdjustable dual shock absorbers with reservoirs
Wheelbase1425 mm (56.1 inches)
Wheels & Brakes
Front Tyre110/80-19
Rear Tyre150/70-17
Front BrakesDouble disc
Rear BrakesSingle disc
Dimensions & Weight
Dry Weight203.1 kg (447.7 pounds)
Power/Weight0.1980 HP/kg
Overall Height1389 mm (54.7 inches)
Overall Length2101 mm (82.7 inches)
Overall Width881 mm (34.7 inches)
Fuel Capacity20.06 litres (5.30 US gallons)
Other
StarterElectric
Color OptionsFire Yellow, Sapphire Blue
InstrumentsSiemens Chip LCD dash with digital speedometer, tachometer, odometer, trip odometer, fuel gauge, gear indicator, neutral light, temperature gauge, clock, turn signal and high beam indicators
Carrying CapacityMolded side cases, mounting racks, top box
WarrantyTwo year unlimited mileage
Notes
Adjustable windscreen. Brand previously called California Scooters. Bike imported from China.
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.
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.
