1989 K100RS




Bike has 97,140 miles
I have never wrecked the BMW, but there are scratches from previous owner(s). Bike tipped over in garage and broke right driver foot peg and I am replacing it. The original seat was torn when I bought the bike. I replaced the seat about 2011 but while not as bad that one ripped as well.

I have owned it since 2007. I quit riding it in 2013 when my wife asked me to purchase a 2004 Harley-Davidson.
Philip S. Ruckle Jr.
Manteo, NC
H: (252) 473-1301
C: (252) 305-0558
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K100RS
Manufacturer BMW
Production 1982–1992
Assembly Spandau, Germany
Class standard, sport touring
Engine longitudinal DOHC I4, 987 cc (60.2 cu in)
Bore / stroke 67 mm × 70 mm (2.6 in × 2.8 in)
Compression ratio 10.2:1
Top speed 137 mph (220 km/h)
Power 90 hp (67 kW) @ 8000 rpm
Torque 63.3 lb·ft (85.8 N·m) @ 6000 rpm
Ignition type electronic
Transmission 5-speed foot shift, shaft drive
Frame type tubular steel, open cradle with engine as stressed member
Suspension telescopic forks, single-sided swingarm
Brakes triple discs
Weight 536 lb (243 kg)(wet)


Water cooled, 987cc, Inline-4, DOHC


Dimensions
Physical measures
Length: 87.4 inch
Width: 31.5 inch
Height: 50 inch
Wheel base: 59.7 inch
Ground clearance: 6.89 inch
Seat height: 31.5 inch
Weight
Curb weight: 518.1 lbs
Chassis and suspension
Frame type: steel, twin spar
Front
Suspension: Cartridge
Suspension travel: 5.31 inch
Brake: Twin Disk, Ø12.01 inch
Tire: 120 / 70 R17 ZR
Rear
Suspension: mono shock, Paralever
Suspension travel: 5.51 inch
Brake: Disk, Ø11.22 inch
Tire: 160 / 60 R17 ZR
Power: 99.93 HP (73.5 kW) @ 8000 rpm
Torque: 100 Nm (73.76 lb-ft) @ 6000 rpm
Final drive: Shaft
Top speed: 145.4 mph
Curb weight: 518.1 lbs

Engine and transmission Switch unit
Engine type: 4 cylinders, 4-stroke, Inline
Displacement: 987 cc (60.31 cubic inches)
Bore × stroke: 2.64 inch × 2.76 inch (square)
Cooling system: Water cooled
Power: 99.93 HP (73.5 kW) @ 8000 rpm
Torque: 100 Nm (73.76 lb-ft) @ 6000 rpm
Throttle: Cable operated

Valves
Valve train: DOHC, variable
Valves per cylinder: 4
Fuel and ignition
Sparks per cylinder: 1
Fuel supply system: Fuel injection
Compression: 11:1
Engine mounting: Longitudinal
Lubrication system: Wet sump
Gear box: Manual 5-speed
Clutch: Dry, single plate, cable operated
Final drive: Shaft
Spark plug pipe type: Bosch, XR 5 DC
Motor oil: 10W/40
Starter: Electric

Other

Power-to-weight ratio: 0.31 KW/lbs (3.20 lbs/HP)
Acceleration (0-60 mph): 3.9 sec
Top speed: 145.4 mph
Fuel capacity: 5.81 gals
Number of riders: 2 persons

Various models of the K100 were produced.
K100, with no fairing.
K100RS, with sports fixed fairing and lower bars.
K100RT, with full fairing for 'road touring'.
K100LT, with a higher screen and additional equipment as standard for 'Luxury Touring'.
All models have dual front, and single rear disk brakes. The RS model has a longer gear ratio than other models.

The K-series offered additional refinements including: all stainless steel exhaust, rust-resistant aluminium fuel tank (although tanks do corrode at the low points on right and left sides), anti-lock brakes or ABS on later-year models, adjustable headlight, high capacity 460 watt alternator, Hella accessory plug-in, self-cancelling signal lights.


BMW's motorcycle history began in 1921 when the company commenced manufacturing engines for other companies. Motorcycle manufacturing now operates under the BMW Motorrad brand. BMW (Bayerische Motoren Werke AG) introduced the first motorcycle under its name, the R32, in 1923.

In early 1983, BMW introduced a 987 cc, in-line four-cylinder, water-cooled fuel injected engine to the European market, the K100. The K series comes with a simplified and distinctive rear suspension, a single-sided swingarm.

In 1988, BMW introduced ABS on its motorcycles. ABS became standard on all BMW K models. It has since become available as an option on the rest of BMW's motorcycle range.

In 1989, BMW introduced its version of a full-fairing sport bike, the K1. It was based upon the K100 engine, but now with four valves per cylinder. Output was near 100 hp (75 kW).


K SERIES STRAIGHT ENGINES
The K series BMWs have water-cooled engines of three (K75), or four (K100, K1100, K1200, K1300), or six (K1600) cylinders. Up until 2004, all K series engines, whether three or four cylinders were that of the original "flying brick" layout, so called due to the external appearance of the engine. The layout of these original K engines is unique within motorcycling in that the engine is mounted lying on its side, with the crank on the right side of the bike and the cylinder heads and /valve gear on the left. This format had the advantage of allowing the drive system to have only one 90-degree translation within the final drive housing, potentially reducing drive train losses. All of the original format K engines were also mated to a dry automotive-type clutch. The uniform use of the traditional K engine ceased with the K1200 models in 2005, with a new 1200 series engine that was radically different from the flying brick in that it was a conventional transversely 55-degree slant-mounted four-cylinder engine coupled to a wet clutch and a unit construction gearbox. It was at this time also that the K bike shaft drive moved from the right side to the left. Despite this new engine, the traditional flying brick K engine continued in service with the giant K1200LT luxury touring bike until 2009, at which point the flying brick bowed out along with the K1200LT. This was the event that presaged the development of the ultimate K engine in terms of size and complexity, the six-cylinder K1600 series fitted to the K1600GT and GTL models.


RS - Originally stood for Rennsport, but since 1976 has stood for Reisesport


The K100 was manufactured from 1983 to 1991. BMW produced 12,871 K100 base model, 34,804 K100RS, 22,335 K100 RT, and 14,899 K100LT. The only difference on the K100RS is a different ratio of the differential.

The first models were not designed to run with unleaded gas. This modification started only in January 85 for K100 with frame number 0007291, November 1984 for the K100 RS (frame number 081107) and frame number 0024999 for the K100RT.

-The fairing of the RS is only efficient for people shorter than 1.80 m. It creates a back draft in your neck and in the face of the passenger.

-The majority of K100 do not consume oil. Until August 1988, K100 parked on the side stand were puffing a cloud of blue smoke when the engine started. The engine oil had the tendency to seep into the combustion chambers. On the 1988 models, BMW has developed pistons and rings with a different design to resolve this inconvenience.

-The oil level sight glass while convenient tends to darken with time.



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