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BMW R 100GS Paris Dakar

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Make Model

BMW R 100GS Paris Dakar

Year

1988 -89
Engine Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder

Capacity

980 cc / 59.8 cu in.

Bore x Stroke

94 x 70.6 mm
Cooling System Air cooled
Compression Ratio 8.5:1

Induction

2 x Bing carburetors

Ignition 

Electronic ignition, Bosch
Alternator Bosch 12V/280 W
Starting Electric

Max Power

44 kW / 60 hp @ 6500 rpm

Max Power Rear Tyre

41.7 kW / 56 hp @ 6500 rpm

Max Torque

76 Nm / 7.75 kgf-m / 56 ft-lb @ 3750 rpm
Clutch Dry single plate, with diaphragm spring

Transmission 

5 Speed 
Gear Ratio 1st 4.40 / 2nd 2.86 / 3rd 2.07 / 4th 1.67 / 5th 1.50:1
Rear Wheel Ratio 1:3.09
Bevel / Crown wheel 11/34 teeth
Final Drive Shaft
Frame Double loop tubular frame with bolt on rear section

Front Suspension

Telescopic fork with hydraulic shock absorber.

Front Wheel Travel 225 mm / 8.8 in

Rear Suspension

Paralever adjustable preload, rebound damping compression

Rear Wheel Travel 180 mm / 7.0 in

Front Brakes

Single ∅285mm disc, 2 piston caliper

Rear Brakes

200 Drum
Front Wheel 1.85 - 21 MTH 2
Rear Wheel 2.50 - 17 MTH 2

Front Tyre

90/90-21

Rear Tyre

130/80-17

Dimensions

Length 2290 mm / 90.1 in
Width    1000 mm / 39.3 in
Height 1165 mm / 45.8 in
Wheelbase 1514 mm / 59.6 in
Seat Height 850 mm / 33.5 in
Ground Clearance 200 mm / 7.9 in

Wet Weight

236 kg / 519 lbs

Fuel Capacity 

35 L / 8.1 US gal

Average Consumption

7.1 L/100 km / 14 km/l / 33 US mpg

Braking 60 km/h - 0

15.3 m / 50.2 ft

Braking 100 km/h - 0

44.8 m / 147 ft

Standing ¼ Mile

13.1 sec / 158 km/h / 98 mph

Top Speed

176 km/h / 109 mph
Road Test

Adventure Group Test Motosprint 1989

Adventure Group test Motosprint 1990

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In the 1980, BMW began an unlikely assosiation with the Paris Dakar Rally. At that time, the then 2 year old rally had been dominated by some rather uncommon machines: hand prepared BMW Airhead boxers. The demands of the Sahara were too great for the average dirt bike of the time. What was needed to win was a stone reliable machine with great range. To answer that question, teams prepared motorcycles that were largely stock, right down to their factory Bing or Dellorto carburetors. Yes, they ran more efficient air cleaners and open exhausts but power does not win Dakar, reliability and consistent performance does. The frames were reinforced, swingarms were lengthened and long travel shocks installed. The best forks and brakes of the day were pulled from KTM motocross bikes and installed on the BMW desert sleds. To finish the machine off, huge fuel tanks were fitted. Some of these hand hammered aluminum tanks held more than 11 gallons (US) of fuel. Of course the well known BMW shaft drive was largely impervious to the 5000+ miles of sand each machine would face. Yes, it was heavy but it was stone reliable and easy to maintain and that's what it took to win Dakar. Gaston Rahier and others rode these beasts to win after win. Yes, other bikes were faster or lighter but in the end, the reliability and the comfortable pace maintained by the BMW's eventually dominated.



BMW Accidentally Creates a New Genre of Motorcycling

To celebrate this achievement, BMW built Paris Dakar commemoritave bikes beginning in 1981. Labled the BMW R80GS, the bike featured white paint and a color scheme strangely reminescent of the rally bikes. It was basically a doctored R80 with longer travel suspension and high fenders. It also featured an uncommon feature for the day: a single sided swingarm. Labled the "MonoLever" it housed the ring & pinion in the right side of the swingarm. On the opposite side of the wheel, three lug bolts secured the wheel to the ring gear. The GS didn't really offer more fuel capacity or serious off-road capability but just as the 1975 GL1000 Gold Wing accidentally became the touring standard, the little GS invented a new segment of the market previously ignored: Adventure Touring. Imagine touring for days on paved roads, only to see a gravel road meanering off into the mountains--a gravel road you don't dare take your plastic wrapped touring barge onto. That's the market the R80GS was destined to dominate.

The BMW R80 GS enjoyed a small but rabidly enthusiastic and growing market. It continued largely unaltered from 1981 through 1987. In 1988, the machine recieved its first major revamp becoming the R100GS. We have a "Bumblebeemer" example of the 1988 model year here. The 1988 upgrade included a displacement bump from 800 to a full 1000cc's. The 800cc displacement was still available outside the United States albeit, with the newer chassis and styling. The new bike featured longer travel, stiffer front forks and another upgrade to the rear suspension, becoming the Paralever. This new system floated the ring & pinion housing with a torque arm, virtually eliminating the characteristic shaft drive pogo-effect while transitioning the throttle. This bike inched closer still to the BMW rally bikes that had also enjoyed continued success over in Africa.



1990 was to see the introduction of an official "Paris Dakar" conversion kit. This kit included a 9.0 gallon nylon fuel tank, a steel 'roo-bar' around a new fixed headlight assembly and instrument cluster with tachometer. Underneath, larger, vented skid plates attached to both the engine and the centerstand. A plastic fender extension--looking every bit like a childs sand shovel--added length to the front fender. Later in 1990, BMW began offering the 'kit' on factory motorcycles and labled it the R100GS/Paris Dakar. The factory bikes also included the factory BMW hard bags as standard equpment, as well as heated grips.

I vividly remember reading Bill Stermer's article in 1990 reviewing the new machine, as well as Clement Salvadori's awesome trip through Engineer Pass in Colorado. You didn't have to be a fan of the Paris Dakar Rally to see why this bike was so alluring. With its plush, long travel suspension, honest 300 mile range (before you start LOOKING for gas) and factory hard luggage, the big boxer quickly became a favorite among street-going BMW fanatics. Never mind taking it off road, this was a GREAT road bike. It quickly became one of BMW's best selling models and to this day, it is often argued to be the very best all-around Airhead BMW ever made. In later years, the Paris Dakar name had to be dropped due to licensing issues with the rally organizers so it was simply shortened to PD.

Source cifumotorsports.com