ST4S (2005)

Engine
Type
L-Twin cylinder, 4 valves per cylinder Desmodromic, liquid cooled
Displacement
996cc
Bore x Stroke
98 x 66mm
Compression Ratio
10.5:1 
Power
116hp - 85kw @ 8750rpm
Torque
10kgm @ 7250rpm
Fuel Injection
Marelli electronic fuel injection, 50mm throttle body
Exhaust
2 aluminium mufflers with catalytic converter (non-catalytic on USA version)
Trasmission
Gearbox
6 speed
Primary drive
Straight cut gears, ratio 1.84
Ratio
1st 37/15, 2nd 30/17, 3rd 27/20, 4th 24/22, 5th 23/24, 6th 24/28
Final drive
Chain; Front sprocket 15; Rear sprocket 38
Clutch
Wet multiplate with hydraulic control
Chassis
Frame
Tubular steel trellis
Front suspension
Showa 43mm upside-down fully adjustable fork with TiN surface treatment
Front Wheel
5-spoke light alloy 3.50 x 17
Front Tyre
120/70 ZR17
Rear suspension
Progressive linkage with fully adjustable Öhlins monoshock with remote control preload adjustament. Aluminium swingarm
Rear Wheel
5-spoke light alloy 3.50 x 17
Rear Tyre
180/55 ZR17
wheel-travel-front
130mm / 5.1in
wheel-travel-rear
130mm / 5.1in
Front Brake
2 x 320mm semi-floating discs, 4-piston caliper
Rear Brake
245mm disc, 2-piston caliper
Instrumentation
Electronic instrument panel using CAN communication protocol with CPU, multifunctional digital display (including speedometer, clock, water temperature, fuel gauge, instant/average consumption, consumed fuel, remaining distance), analog rev counter, self-adjusting pilot lights (depending on outdoor light), headlight angle adjustment, immobilizer system.
Dimensions and Weights
Dry Weight
201kg / 442.7lb
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)
Number of Seats
Two seats
Warranty and Maintenance
Warranty
2 years unlimited mileage
Emissions and Consumption
Standard
Euro2