BMW R-71 Technical
Specifications and Technical Details

During WWII Germany deployed highly mobile motorized troops. The BMW R-71, R-75 and its competitor; the Zündapp KS 750 widely used by the Wehrmacht, Luftwaffe and SS in large numbers. Here I'll collect all the technical and maintenance information on the R-71 (also applicable to the CJ-750).

Years of production 1938 - 1941 Ratios 1st: 3.6:1, 2nd: 2.29:1, 3rd: 1.71:1, 4th: 1.3:1 (1 : 3.89 with sidecar)
Total production 3458 units Length 2130 mm / 83.85 in
Engine 4-stroke boxer twin Width 815 mm / 32.08 in
Capacity 746cc flathead sidevalve Height 960 mm / 37.79 in
Horsepower 22 hp @ 4600rpm Wheelbase 1400 mm / 55.11 in
Bore/Stroke 78 x 78 mm / 3.07 x 3.07 in Track 42 in / 1066 mm
Compression ratio 5.5:1 Ground clearance 4.7 in / 120 mm
Carburettor Graetzin G24, .1 main jetGross weight 794 Lbs / 360 kg
Clutch dry single plate Capacity 3 adults & 220 pounds / 100 kg
Final drive shaft Maximum speed 94 kph / 58 mph (with sidecar)
Electrical system 12 volt Tires 3.5 x 19 inches
Generator Bosch RD 50/6 2800 RS 17 Fuel capacity 14 ltr / 3.07 gal Imp / 3.69 gal US
Spark Plugs Bosch W 175 T1 Fuel ecomomy 33 mpg / 4.5 Ltr/100km
Gearbox 4 speed + reverse Price 1595 RM (Reichmarks) ~3970 US

Links for the BMW R-71

Technical Documents
Technical DrawingsScans from BMW repair manuals and factory blue lines.
BMW ManualScaned BMW owner manual from 1938.

Repair and Maintenance
CJ-750 ModificationsModifications I've done to my CJ750.
CJ-750 ToolboxListing of fix-it articles on the CJ750.
Assembly by Ray CostaAssembly PDF file for 'kit bike' CJ750 imported in a crate.
Chaingjang SidecarVendor of parts and bikes.
Russian Lubrication ChartA lube chart in Russian for URAL 750.

Parts and Supplies
Blitz BikesFeaturing Classic and Military BMW, Zündapp, and Chang Jiang Motorcycles, Kübelwagen, and Parts and Accessories
Hummer EmproiumVintage motorcycle parts and cloth covered wiring.

Vintage Photographs
Vintage PhotosPhotos of German bikes in period; WWII.

Modern Photographs
Modern PhotosModern photos of German bikes and historical clones.

Specialty Photographs
Specialty PhotosPhotos of German bikes with unusual accessories or trick riding.

Video Links
Motorcycle riflemenPropaganda film of motorcycle infantry combat operations.
Trick ridingReenactor engages in some pretty cool trick riding.
Reenactor convoyConvoy of BMWs and Kubelwagens.
R-75 in the mudBMW R-75 tackles a muddy trail.
KS 750Zundapp KS 750 with trailer train.
ZundappVideo of a well restored Zundapp.

General Interest Links
Oldtimer gallery; BMW R71Great photos of BMWs as well as all sorts of other WWII vehicles.
John's Beemer GarageTons of photos and information on vintage BMWs especially R-75s.

Important Disclaimer! - This is a non-political web page dealing with the history, equipment, life and campaigns of the World War II German airborne soldier (Fallschirmjäger) and World War II reenacting. This website is contains historical information as well as reenacting and living history information. This information includes reenactment photos, historical information covering operations, equipment and photos of World War II Fallschirmjäger in action. The information is catalogued and presented to preserve a clear eyed view of military history and present to the public an accurate representation of a World War II German airborne unit. We do not tolerate or condone any form of racism, radical or extremist activities, or persons with supremacist, fascist or racist political motives or beliefs and we do not support nor glorify the reprehensible policies of the Nazi Party. We do not tolerate, support, or condone any activities of any neo-nazi party organizations, any extremist, anti-immigrant or anti-semetic organizations.
Question? Feldpost der feldwebel.

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