| | | | More details: BMW F800GS and F650GS |  Written: 26/11/2007 : 13:59. Read 25278 times (44/day). | With two completely new enduro models, the F 800 GS and F 650 GS, BMW Motorrad is not just expanding its range of products but also presenting a worthy successor to the successful single-cylinder F 650 GS.
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The parallel twins’ drive comes from the F800 model series, but beyond this, the new enduro models have been completely redesigned: new frame and new wheel suspension with new spring-shock absorber elements. The previous model’s belt drive and single-strut swing arm have been replaced by a light chain drive in combination with a very stable and attractive aluminium profile, double-strut swing arm.
The new F 650 GS differs from its higher capacity variant by featuring a lower seat height, lower weight and slightly reduced engine power. Compared with its single-cylinder predecessor, the new F 650 GS is an improvement in every area. Despite its designation, which usually refers to the engine size, the F 650 GS has the same 800cc twin-cylinder engine as the F 800 GS. With slightly reduced engine power (71 instead of 85HP) the focus for the F 650 GS is on high torque at lower engine speeds coupled with excellent economy.
The F800GS 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.
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 liquid-cooled four-valve twin-cylinder engine provides 63kW / 85HP at 7,500 min–1 and, at 5 750 min–1 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 low dry weight of 178kg makes a major contribution to the dynamic riding properties. When filled with petrol the F 800 GS weighs only 207kg.
The F 650 GS is 8kg lighter. 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: 52kW / 71HP at 7, 000 min–1 and a maximum torque of 75Nm even at 4,500 min–1. Because of the reduced power, there is no need for a secondary air system because fewer un-combusted gases enter the exhaust system. A 25kW / 34HP version is also available for riders who have only just passed their test.
Technical data: BMW F 800 GS, F 650 GS | | BMW F 800 GS | BMW F 650 GS | | | | Engine | | | | | Capacity | cm3 | 798 | | | |
Bore/lift | mm | 82/75,6 | | | | | Power | kW/HP | 63/85 | 52/71 | | | | at engine speed | min–1 | 7 500 | 7 000 | | | | Torque |
Nm | 83 | 75 | | | | at engine speed | min–1 | 5 750 | 4 500 | | | | No. of cylinders | | 2 | |
| | | Compression/fuel | :1 | 12.0/Super unleaded (95 RON) | 12.0/Normal unleaded (91 RON) | | | Valve/gas control | | dohc (double overhead camshaft) | |
| | | Valves per cylinder | | 4 | | | | | Diam. inlet/outlet | mm | 32/27,5 | |
| | | Throttle valve diameter | mm | 46 | | | | | Mixture preparation | | Electronic
manifold injection, engine management BMS-KP | | | | | | | Electrical system | | | | | Generator | W | 400 | | |
| | Battery | V/Ah | 12/14 | | | | | Headlights/rear light | W | 55 (full/dipped beam) 5 parking light LED (braking/rear light) |
| | Starter | kW | 0.9 | | | | | | | | Power transmission/gears
| | | | | Clutch | | Multidisc clutch in oil bath, mechanically activated | | | Gears | | Dog-coupled six-gear transmission | | | Primary transmission | | 1:1.943 | |
| | | Transmission, gear stages I | | 1:2.462 | | | | | II | | 1:1.750 |
| | | | III | | 1:1.381 | |
| | | IV | | 1:1.174 | | | | | V | | 1:1.042 | | | | | VI |
| 1:0.960 | | | | | Rear wheel drive | | Endless-O-ring chain drive with back damping in wheel hub | | | Transmission ratio | | 1:2.625 (16/42) | 1:2.412 (17/41) | | | | | | | Chassis | | | |
Frame design | | Tubular frame in steel, partly carrying the engine | | | Wheel suspension, front wheel | | Upside-down telescopic fork,fixed tube Ø 45 mm | Telescopic fork,fixed tube Ø 43 mm | | | Wheel suspension, rear wheel | | Double-strut swing arm, aluminium cast in one piece | | | Spring travel front/rear | mm |
230/215 | 180/170 | | | Castor | mm | 117 | 97 | | | Wheel spacing | mm | 1578 | 1575 | | | Steering head angle | ° | 64.0 |
64.0 | | | Brakes | front | Double-disc brake Ø 300 mm | Single-disc brake Ø 300 mm | | | rear | Single-disc brake Ø 265 mm | Single-disc brake Ø 265 mm | | | | | on request: BMW Motorrad ABS, disconnectable | | | Wheels | |
Spoked wheels with aluminium rims | Cast aluminium wheels | | | front | 2.15x21 | 2.50x19 | | | rear | 4.25x17 | 3.50x17 | | | Tyres | front | 90/90-21 54 V | 110/80-R19 59 H |
| | rear | 150/70-R17 69 V | 140/80-R17 69 H | | | | | | | Dimensions and weights | | | | | Total length | mm | 2 320 | 2280 | | | Total width with mirrors | mm |
945 | 890 | | Total width without mirrors | mm | 870 | 845 | | | Seat height | mm | 880 (SA 850) | 820 (SA 790) | | | Dry weight | kg | 178 |
171 | | | | DIN tare, ready to drive | kg | 207 | 199 | | | | Perm. total weight | kg | 443* | 436* | | | Tank capacity | l | 16 | 16 | |
| | | | | | | | Travel data | | | | | | | Fuel consumption 90 km/h | l/100 km | 3,8 | 3,7 | | | | 120 km/h | l/100 km | 5,2 | 5,2 | | |
Acceleration 0–100 km/h | s | 4,1 | 4,3 | | | | Maximum speed | km/h | over 200 | 189 | | |
*with lowering kit: payload 150 kg
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