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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

BMW_F800GS

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

BMW_F650GS

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