BMW R 80G/S (1983)

BMW R 80G/S (1983)

The BMW R80G/S, unveiled to great surprise, defies conventional wisdom with its 800cc enduro machine that excels on both pavement and dirt trails. By leveraging the lightweight and simplicity of their classic flat-twin engine, BMW has crafted a dual-purpose machine that rivals the performance of its lighter two-stroke competitors.

This trail blazer boasts an impressive array of features, including a braced handlebar, increased ground clearance, and a robust disc front brake. Its versatility is further underscored by the inclusion of road gear such as a lockable dual seat, passenger pegs, mirrors, and a powerful disc front brake.

The engine’s character is marked by a smooth, linear power delivery, making it an absolute delight to ride on both paved roads and rugged trails. As a testament to BMW’s ingenuity, the R80G/S has successfully bridged the gap between off-road and on-road performance, cementing its position as a trailblazer in the world of dual-purpose motorcycles.

Key Specifications

Engine TypeFour stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.
Engine Capacity797.5 cc / 48.7 cu in.
Max Power37 kw / 50 hp
Max Torque56.7 Nm / 5.8 kgf-m / 41 ft lb @ 5000 rpm
Fuel Tank Capacity19.5 L / 5.1 US gal
Weight (Wet/Kerb)409 lbs / 186 kg
Seat Height33.9 inches / 860 mm
BMW R 80G/S (1983)

All Specifications

Make & Model

ModelBMW R 80G/S
Year1983

Engine

Engine TypeFour stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.
Displacement797.5 cc / 48.7 cu in.
Bore x Stroke84.8 x 70.6 mm
Compression Ratio9.2:1
Max Horsepower37 kw / 50 hp
Max Torque56.7 Nm / 5.8 kgf-m / 41 ft lb @ 5000 rpm
Engine Management System2 x Bing constant depression carburetorss
Cooling SystemAir cooled

Performance

Top Speed167 km/h / 104 mph

Transmission

ClutchDry single plate, with diaphragm spring
Gearbox5 Speed
Gear Ratios1st 4.40 / 2nd 2.86 / 3rd 2.07 / 4th 1.67 / 5th 1.50:1
Final DriveShaft

Electrical & Electronics System

StarterElectric & Kick

Chassis & Suspension

Frame TypeDouble loop tubular frame with bolt on rear section
Front SuspensionTelescopic hydraulic forks
Front Suspension Travel7.8 inches / 200 mm
Rear SuspensionMonolever swinging arm
Rear Suspension Travel6.6 inches / 170 mm

Wheels & Brakes

Front Tire Size3.00 – 21
Rear Tire Size4.00 – 18
Front BrakesSingle ∅260mm disc
Rear Brakes∅200mm Drum

Dimension & Weights

Seat Height33.9 inches / 860 mm
Wheelbase67.6 inches / 1465 mm
Ground Clearance175 mm / 6.88 in
Fuel Tank Capacity19.5 L / 5.1 US gal
Wet (kerb/curb) Weight409 lbs / 186 kg

Features

  • Electric starter (optional)
  • Lighter clutch
  • Redesigned clutch with altered disengagement leverages
  • Wider friction point
  • Improved gear change action
  • No steel liners in cylinders
  • Hard nickel-alloy surfaces (Galnikal) in cylinder bores
  • 101lb weight saving
  • Inertial reduction for easier handling
  • Revised lubrication circuits
  • Oil pump supplies main bearings direct
  • 84.8 x 70.6mm bore and stroke
  • 3.00 x 21 and 4.00 x 18 wheels
  • Akront alloy rims
  • Plastic mudguards with extra clearance
  • Braced handlebar 32 inches wide
  • More ground clearance
  • Sump guard
  • Cleated foot-pegs
  • Lockable dual seat
  • Passenger pegs
  • Mirrors
  • Disc front brake

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