Jawa 42AttributeYamaha RX100
293Displacement (cc)98
27.33Maximum Power11 PS @ 7500 rpm
28.0Maximum Torque10.39 Nm @ 6500 rpm
27.33Peak Power11.0 HP (11.0 PS) @ 7500 rpm
1Number of Cylinders1
SOHCValve ConfigurationReed Valve (Two-Stroke)
2Valves Per CylinderNot Applicable (Two-Stroke)
76Bore50.0 mm (International Spec)
65Stroke50.0 mm (International Spec)
76 x 65Bore x Stroke50.0 mm x 50.0 mm
11:1Compression Ratio6.7:1
LiquidCooling SystemAir Cooled
Electronic Fuel InjectionFuel Supply SystemCarburetor (Mikuni VM20)
Transistorized Coil IgnitionIgnition SystemCDI (later models) / Point Ignition (early models)
VerticalEngine LayoutStandard
10W-40Engine Oil Grade2 Stroke Engine Oil (Separate oil tank for Autolube)
5000Valve Adjustment Interval—
Electric & KickStarting SystemKick Start
YesEngine Kill SwitchNo
0.204Power-to-Weight RatioNot Available (Old Model)
BS6Emission Standard35−40 km/L (User Reported)
12Battery Power105−110 km/h (Factory/Tuned)
NoPower Mode IndicatorN/A (Known for fast acceleration in its class)
—Power Consumption1.3 Litres (Gearbox/Transmission Oil)
—Motor Power10.5 Litres (including reserve)