1938 BMW R71 Specs

motorcycle specs

These are the known mechanical and performance specifications for your 1938 BMW R71.

Basic Specs

Year1938
MakeBMW
ModelBMW R71
Cost

Engine

Displacement746.00 ccm (45.52 cubic inches)
Type
DetailsTwo cylinder boxer, four-stroke
Max RPM
Compression5.5:1
Bore/Stroke78.0 x 78.0 mm (3.1 x 3.1 inches)
Valves/Cylinder
FuelingCarburettor. Graetzin G24
Ignition
Exhaust
LubricationWet sump
CoolingAir

Drivetrain

Gearbox4-speed
Final DriveShaft drive (cardan)
ClutchDry-single plate-cable operated
Driveline

Performance

Horespower22.03 HP (16.1 kW)
Torque
Top Speed125.0 km/h (77.7 mph)

Fuel Economy & Polution

Fuel Consumption4.50 litres/100 km (22.2 km/l or 52.27 mpg)
Fuel Capacity14.00 litres (3.70 gallons)
Emissions104.4 CO2 g/km. (CO2 - Carbon dioxide emission)

Chassis

Frame TypeTubular steal duplex cradle
Rake
Trail
Front SuspensionCartridge
Front Travel
Rear SuspensionTwin shock-swingarm
Rear Travel
SeatSingle seat
Seat Height
Alt. Seat Height
Total Height960 mm (37.8 inches)
Total Length2,130 mm (83.9 inches)
Total Width815 mm (32.1 inches)
Ground Clearance
Wheelbase1,400 mm (55.1 inches)
Dry Weight
Wet Weight187.0 kg (412.3 pounds)

Wheels & Brakes

Front Tire/Tyre3.5-19
Rear Tire/Tyre3.5-19
Front BrakesExpanding brake (drum brake). Single
Front Brake Diameter200 mm (7.9 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Diameter200 mm (7.9 inches)
WheelsSpoked

Comments

It appears you're interested in specifications for the BMW R71. This Custom / cruiser model is powered by a Two cylinder boxer, four-stroke engine with 746.00 ccm (45.52 cubic inches) of actual displacement before 5.5:1 compression. Fueling is metered via Carburettor. Graetzin G24 allowing this machine to produce its 22.03 HP (16.1 kW) horsepower and torque. According to our records engine heat of the BMW R71 is moderated by Air. You'll need to get familiar with the 4-speed transmission and pay attention to final drive Shaft drive (cardan) maintainence. Our best information shows that the front tire size is 3.5-19 and the rear is 3.5-19 . The entire package is supported by the frame, Tubular steal duplex cradle. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Expanding brake (drum brake). Single front brakes and Expanding brake (drum brake) rear brakes. The BMW R71 was launched in 1938, and we're happy to know (or assume) you've got one in your garage. To help you keep your ride in tip-top shape, consider purchasing an owner or service manual.