Fun factor 86 Nm. The engine.
Instantaneous power.
The Parallel Twin ² tted to the BMW F 800 S and ST is our
new high-tech, middleweight power plant. With a capacity
of 798 cc, it delivers terri² c punch right across the rev
range. During development, our engineers didn’t seek to
achieve as high a revving engine as they could, but to
make the motorcycle as easy to control and ride as possible.
As a result, fully 90% of the maximum torque of 86 Nm
(at 5,800 rpm) is available from 5,000 rpm, while 62.5 kW
(85 hp) ensures that all the excitement is transmitted
directly to the road.
Good question: why?
Through the long stroke design of the engine, exception-
ally smooth torque delivery allows the rider to easily skip
gears if desired. The high-performance cylinder head
means the engine remains agile and responsive well into
the upper rev range during sports-style riding. Rocker
arms derived from Formula 1 technology play an important
part in this, operating the two-cylinder engine’s eight
valves. This reduces friction to a minimum, while boosting
rpm stability to its maximum.
The low moving mass and the stiffness of the valve train
expose individual components to lower stresses, meaning
the BMW F 800 S and ST offer exceptionally low petrol
consumption levels and impressive torque characteristic,
while being extremely reliable. Dry sump lubrication ensures
optimum oil supply in all riding situations and leads to a
reduction in the overall dimensions of the engine. The oil
tank is located in the oil pan, which is sealed completely
to the crankcase, meaning a separate oil tank is not neces-
sary. As with the 4-cylinder BMW Motorrad power unit, the
narrow width of the engine makes it possible to position
the water pump to the right side of the cylinder head,
reducing the number of short radiator hoses required.
For inexperienced riders, a reduction in engine power can
be provided at no extra cost, achieved by way of a reduced
throttle valve opening angle, so that the bike then outputs
25 kW (34 hp) at 7,000 rpm and 55 Nm at 3,500 rpm.
1.000 rpm
9
8
7
6
5
4
3
2
1
40 80 120 160 200 240 km/h
100
90
80
70
60
50
40
30
20
kW
200
180
160
140
120
100
80
60
40
kW
Nm
2 4 6 8 10 12 1.000 rpm
Nm
Truly entertaining.
Conventional telescopic forks with a diameter of 43 mm
and 140 mm of travel look after front wheel guidance,
suspension, damping and anti-dive control. High overlay
of the stanchions and fork sliders gives a high level of
stiffness and ensures outstanding roadholding, while the
steering damper offers maximum stability, even during
sports-style riding. The aluminium Delta Box frame used
in the F 800 S and ST is extremely torsion-resistant and is
responsible for the motorcycles’ precise, yet exhilarating
handling.
A leader amongst bikes.
The engine is the fundamental strength of the F 800 S/ST.
It accommodates an aluminium swing arm which, in
combination with the low-maintenance belt drive, is
unique in this segment. The wide design of the eccentric
rear wheel mounting ensures that the wheel is always held
in the correct position lengthways. Fitting and removing
the
rear wheel is quick and simple, as is tightening the
belt, and the fact that the belt drive and swing arm
complement each other so well leaves you free to
concentrate on riding. Easy access is provided to the
handwheel, used to set the spring preload of the directly-
linked single suspension strut, while adjusting the strut’s
rebound damping is just as easy, meaning the machine
can be quickly adapted to a variety of load conditions.
Fun to the power of two. F 800 S and F 800 ST.
For those who enjoy taking their machine for longer
journeys, the F 800 ST offers an attractive alternative
to the F 800 S. It comes with a high windshield and full
fairing, for better protection from the wind and rain. With
its raised handlebars, the machine’s ergonomics are also
much better suited to touring, whilst its large aluminium
luggage grid offers extra space for your bags.
Speaking the language of the street. The chassis.
15
To Next Page
Loading...
