|
BMW
F800GS and F650GS |
Specs - 2008 - F800GS (from http://www.bmw-motorrad.com
)
Engine: Water-cooled, 2-cylinder, 4-stroke,
four valves per cylinder, two overhead camshafts, dry
sump lubrication
Capacity: 798 cc
Rated output: 63 kW (85 hp) at 7,500
rpm (optional 91 RON version: 61 kW (83 hp) at 7,500 rpm)
Max. torque: 83 Nm at 5,750 rpm (optional
91 RON version: 81 Nm at 5,750 rpm)
Emission control: Closed-loop 3-way catalytic
converter, emission standard EU-3
Tyre, front / rear: 90/90 - 21 54V /
150/70 - 17 69V
Wheelbase: 1,578 mm
Brake, front: Twin disc, floating brake
discs, diameter 300 mm, double-piston floating calipers
Brake, rear: Single disc, diameter 265
mm, single-piston floating caliper
ABS: Optional extra: BMW Motorrad ABS (can be switched
off)
Seat height: 880 mm (low seat: 850 mm)
Inner leg curve: 1,940 mm (low seat: 1,900 mm)
Dry weight 1): 185 kg
Unladen weight, road ready, fully fuelled
2): 207 kg
Usable tank volume : 16,0 l
Technical data relate to the unladen weight (DIN)
1) Unladen weight without fluids
2) According to guideline 93/93/EWG with all fluids, fuelled
with at least 90 % of usable tank volume
The drive system is the F 800 S parallel
twin – now with its cylinders inclined only 8.3
degrees forward – modified for the new demands.
The strong, liquid-cooled four-valve twin-cylinder engine
is particularly suitable because of its instantaneous
response, impressive torque and low fuel consumption.
Nominally, the engine provides 63kW at 7,500 rpm and,
at 5 750 rpm outputs a torque value of 83 Newton metres
to the sliding bearing-based crankshaft. Thanks to the
regulated three-way catalytic converter and secondary
air system, the twin releases power that is environmentally
friendly. The mass balance is provided by a system that
is unique in standard motorcycle design: an additional
swivel conrod balances the first and second level mass
forces and ensures that the twin-cylinder engine produces
minimum vibration
The chassis combines all the features
of a true enduro: a sturdy steel-tube frame that allows
a steering lock of 42 degrees; a rigid upside-down forks
with 230mm spring travel; a sturdy aluminium double-strut
swing arm with a path-dependent cushioned spring strut
and 215mm spring
travel; and solid wire-spoke wheels. A 21.1-inch front
wheel in the classic enduro dimensions of 90/90-21 gives
running stability during slow off-road riding. The rear
wheel, with dimensions 150/70-17 ensures that the engine
power is always efficiently transferred to the surface.
|
Specs - 2008
- F650GS
Engine: Water-cooled, 2-cylinder, 4-stroke,
four valves per cylinder, two overhead camshafts, dry sump
lubrication
Capacity: 798 cc
Rated output: 52 kW (71 hp) at 7,000 rpm (output reduction
to 25 kW (34 hp) at 5,000 rpm possible)
Max. torque: 75 Nm at 4,500 rpm (with output
reduction: 57 Nm at 3,000 rpm)
Emission control: Closed-loop 3-way catalytic
converter, emission standard EU-3
Tyre, front / rear: 110/80 - 19 59H / 140/80
- 17 69H
Wheelbase: 1,575 mm
Brake, front: Single disc, diameter 300 mm,
double-piston floating caliper
Brake, rear: Single disc, diameter 265 mm,
single-piston floating caliper
ABS: Optional extra: BMW Motorrad ABS (can be switched off)
Seat height: 820 mm (low seat: 790 mm; lowered
suspension: 765 mm)
Inner leg curve: 1,820 mm (low seat: 1,780 mm; lowered suspension:
1.710 mm)
Dry weight 1) : 179 kg
Unladen weight, road ready, fully fuelled
2) : 199 kg
Usable tank volume : 16,0 l
Technical data relate to the unladen weight (DIN)
1) Unladen weight without fluids
2) According to guideline 93/93/EWG with all fluids, fuelled
with at least 90 % of usable tank volume
The F 650 GS is 8kg lighter and with a much
lower seat height is the ideal motorcycle for newcomers. Technically,
it is based on its larger variant but the cast metal wheels
and lower ground clearance indicate that it prefers on-road
use. Other distinguishing features are the smooth-surfaced
side fairings, the low windscreen, other spring elements,
and slightly lower engine power. With 52kW / 71HP at 7, 000
rpm and a maximum torque of 75Nm even at 4,500 rpm, there’s
still plenty of power. Because of the reduced power, there
is no need for a secondary air system because fewer un-combusted
gases enter the exhaust system. |
| Below
are the main differences between the F800GS and F650GS |
BMW F 800 GS
63kW / 85HP
Valve timings as per F 800 S
Wide cooler
Off-road-style fairings
High windscreen
USD telescopic fork
WAD spring strut
Spoked wheels
21" front wheel
Double-disc brake, floating front
Aluminium handlebar
880 / 850mm seat height
Ready-to-drive weight 207kg
|
BMW F 650 GS
52kW / 71HP
Power-reducing valve timing
Narrow F 800 S cooler
Street-style fairings
Low windscreen
Conventional telescopic form
Gas pressure spring strut
Cast metal wheels
19" front wheel
Single-disc brake, front
Steel handlebar
820 / 790mm seat height
Ready-to-drive weight 199kg
Lowering kit (765mm)
Power reduction kit (if required) |
The
power reduction of the F 650 GS is via camshafts with different
cams which reduce the lift and change valve timing. This results
in a shorter valve overlap. The valve drive via cam followers
is low-wear, only produces minimal friction losses, and is
particular rev-proof. The valve play, therefore, only needs
to be checked after 20,000km.
| Valve
timings |
BMW
F 800 GS |
BMW
F 650 GS |
Intake
opens
|
14°
after OT |
28°
after OT |
| Intake
closes |
18°
after UT |
4°
after UT |
| Outlet
opens |
18° after UT |
4°
after UT |
| Outlet
closes |
14°
before OT |
28°
before OT |
| Valve
lift |
9.64
mm |
7.2
mm |
|
| |
|
excerpts
from BMW media information |
