ST4S (2002)

Engine
Type
L-Twin cylinder, 4 valve per cylinder Desmodromic; liquid cooled
Displacement
996cc
Bore x Stroke
98x66mm
Compression Ratio
11.5:1 
Power
116hp - 85kw @ 8750rpm
Torque
10kgm - 98Nm @ 7250rpm
Fuel Injection
Marelli electronic fuel injection, 50mm throttle body
Exhaust
2 aluminum mufflers with catalytic converter (non-catalytic for USA version)
Trasmission
Gearbox
6 speed
Primary drive
Straight cut gears, ratio 1.84
Ratio
1st 37/15, 2nd 30/17, 3th 27/20, 4th 24/22, 5th 23/24, 6th 24/28
Final drive
Chain; Front sprocket 15; Rear sprocket 38
Clutch
Dry multiplate with hydraulic control
Chassis
Frame
Tubular steel trellis frame
Front suspension
Showa 43mm upside-down fully adjustable fork with TIN
Front Wheel
5-spoke light alloy, 3.50 x17
Front Tyre
120/70 ZR17
Rear suspension
Progressive linkage with Sachs adjustable monoshock. Aluminium swing-arm
Rear Wheel
5-spoke light alloy 5.50 x 17
Rear Tyre
180/55 ZR17
wheel-travel-front
130mm / 5.1in
wheel-travel-rear
148mm / 5.8in
Front Brake
2 x 320 mm semi-floating discs, 4-piston caliper
Rear Brake
245mm disc, 2-piston caliper
Instrumentation
Speedometer, rev counter, tripmeter, LCD display with clock, water temperature, fuel level, warning light for neutral, low pressure, indicators for high beams, turns signals, immobilizer
Dimensions and Weights
Dry Weight
212kg / 467lb
Seat Height
820mm / 32.8in
Wheelbase
1430mm / 56.3in
Rake
24°
Fuel Tank Capacity
21l (of which 6l reserve) / 5.5 US gal (of which 1.5 US gal reserve)
Warranty and Maintenance
Warranty
2 years unlimited mileage
Emissions and Consumption
Standard
Euro 2 (exept for USA version)