BMW R100S: review, history, specs

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R100S.jpg
BMW R100S
Manufacturer
BMW
Also called R 100 S
Production 1976 - 1980
Class Standard
Predecessor BMW R90S
Engine
air-cooled, four-stroke, boxer two cylinder, 2 valves per cylidner
Bore / Stroke 94.0mm x 94.0mm
Compression ratio 9.5:1
Top Speed 117 mph (189 km/h)
Horsepower 70.0 HP (52.2 KW) @ 7000RPM
Torque 56.06 ft/lbs (76.0 Nm) @ 6000RPM
Spark Plug NGK BP7ES
Battery YUASA Y60-N24AL-B
Transmission Gear box: 5-speed, manual

Final Drive: shaft

Clutch: dry, single plate, diaphragm spring
Final Drive Shaft
Suspension Front: hydraulic telescopic fork
Rear: dual adjustable shocks
Brakes Front: dual 260mm discs, 2-piston calipers
Rear: 260mm drum
Front Tire 3.25-19
Rear Tire 4.00-18
Wheelbase 57.72 inches (1466 mm)
Length 83.9 inches (2131 mm)
Width 29.41 inches (747 mm)
Seat Height 32.28 inches (820 mm)
Weight 220.0 kg (wet)
Oil Filter K&N KN-161[1]
Fuel Capacity 6.34 Gallon (24.00 Liters)
Related BMW R100T
BMW R100RS
BMW R90S
BMW R100GS
BMW R100RT
Manuals Service Manual

Reviews ·


The BMW R 100 S was a air-cooled, four-stroke, boxer two cylinder, 2 valves per cylidner Naked motorcycle produced by BMW between 1976 and 1980. It could reach a top speed of 117 mph (189 km/h). Max torque was 56.06 ft/lbs (76.0 Nm) @ 6000 RPM. Claimed horsepower was 70.0 HP (52.2 KW) @ 7000 RPM.


History[edit]

Just a few years after introducing the BMW R90/6 and BMW R90S, BMW upped the capacity of its range-topping flat-twins to 980cc for the 1977 season in the form of the '/7' series. The latter comprised the R100/7 tourer, which used the 60bhp version of the new engine, while the cockpit-faired R100S sportster and the fully faired R100RS superbike came with 70bhp on tap. Within a couple of years the R100/7 'naked' had been re-titled R100T and gained an extra five horsepower, while the others - together with the new R100RT super-tourer - continued to use the 70bhp engine.


Engine[edit]

The engine was a air cooled air-cooled, four-stroke, boxer two cylinder, 2 valves per cylidner. A 94.0mm bore x 94.0mm stroke result in a displacement of just 980.0 cubic centimeters. Fuel was supplied via a overhead valves (ohv).

Drive[edit]

The bike has a 5-speed, manual transmission. Power was moderated via the dry, single plate, diaphragm spring.

Chassis[edit]

It came with a 3.25-19 front tire and a 4.00-18 rear tire. Stopping was achieved via dual 260mm discs, 2-piston calipers in the front and a 260mm drum in the rear. The front suspension was a hydraulic telescopic fork while the rear was equipped with a dual adjustable shocks. The R 100 S was fitted with a 6.34 Gallon (24.00 Liters) fuel tank. The wheelbase was 57.72 inches (1466 mm) long.



1976 BMW R 100 S[edit]

The 1976 MY BMW R 100 S has, at its heart, an air-cooled, four-stroke, 980cc, boxer twin cylinder powerhouse paired to a five-speed manual transmission that can produce a claimed 70 horsepower and 76 Nm of torque.

Standard fittings include a hydraulic telescopic fork as a front suspension, dual adjustable shocks in the rear, a dual seat, pillion grab rails, a small, nose-fairing with a windshield, an analogue instrumentation panel, dual front disc brakes coupled to a rear drum brake, die-cast aluminum wheels and a chromed, dual exhaust system.


1977 BMW R 100 S[edit]

1977 BMW R100RS

The 1977 MY BMW R 100 S is a liter-class naked machine, that is sure to fit the taste for those riders who want superior performance. It comes with a hydraulic telescopic fork as a front suspension, dual adjustable shocks in the rear, a dual seat, pillion grab rails, a small, nose-fairing with a windshield, an analogue instrumentation panel, dual front disc brakes coupled to a rear drum brake, die-cast aluminum wheels and a chromed, dual exhaust system.

In the engine department, it sports a four-stroke, air-cooled, 980cc, two cylinder boxer powerplant mated to a five-speed manual transmission and can reach a maximum power output of 70 horsepower and 76 Nm of torque.


1978 BMW R 100 S[edit]

The 1978 MY BMW R 100 S has been created by the German engineers for those riders who make zero compromises when it comes to performance. It boasts a maximum power output of 70 horsepower and 76 Nm of torque from its air-cooled, four-stroke, 980cc, boxer two cylinder engine paired to a five-speed manual transmission.

In addition, it comes standard with features such as a hydraulic telescopic fork as a front suspension, dual adjustable shocks in the rear, a dual seat, pillion grab rails, a small, nose-fairing with a windshield, an analogue instrumentation panel, dual front disc brakes coupled to a rear drum brake, die-cast aluminum wheels and a chromed, dual exhaust system.


1979 BMW R 100 S[edit]

The 1979 MY BMW R 100 S comes with standard fittings such as a hydraulic telescopic fork as a front suspension, dual adjustable shocks in the rear, a dual seat, pillion grab rails, a small, nose-fairing with a windshield, an analogue instrumentation panel, dual front disc brakes coupled to a rear drum brake, die-cast aluminum wheels and a chromed, dual exhaust system.

Also, a maximum power output of 70 horsepower and 76 Nm of torque is achieved by its four-stroke, air-cooled, 980cc, boxer opposed two cylinder powerplant that is paired to a five-speed manual transmission with a shaft final drive.


1980 BMW R 100 S[edit]

The House of Munich has designed and launched the 1980 MY BMW R 100 S for those riders who make zero-compromises when it comes to performance, but also want the sound and feel of a boxer engine. It has, at its heart, an air-cooled, four-stroke, 980cc, boxer twin cylinder powerplant paired to a five-speed manual transmission and can produce 70 horsepower and 76 Nm of torque.

Standard fittings include a hydraulic telescopic fork as a front suspension, dual adjustable shocks in the rear, a dual seat, pillion grab rails, a small, nose-fairing with a windshield, an analogue instrumentation panel, dual front disc brakes coupled to a rear drum brake, die-cast aluminum wheels and a chromed, dual exhaust system.

In Media[edit]


References[edit]

  1. 2019 K&L Supply Co Catalog. K&L Supply Co. 2019.