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 jet | Gross 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 Drawings | Scans from BMW repair manuals and factory blue lines. |
| BMW Manual | Scaned BMW owner manual from 1938. |
| Repair and Maintenance | |
| CJ-750 Modifications | Modifications I've done to my CJ750. |
| CJ-750 Toolbox | Listing of fix-it articles on the CJ750. |
| Assembly by Ray Costa | Assembly PDF file for 'kit bike' CJ750 imported in a crate. |
| Chaingjang Sidecar | Vendor of parts and bikes. |
| Russian Lubrication Chart | A lube chart in Russian for URAL 750. |
| Parts and Supplies | |
| Tires | ENGELBRECHT MOTORCYCLE TIRE ANTIQUE TIRE 350-19 |
| Blitz Bikes | Featuring Classic and Military BMW, Zündapp, and Chang Jiang Motorcycles, Kübelwagen, and Parts and Accessories |
| Hummer Emproium | Vintage motorcycle parts and cloth covered wiring. |
| Vintage Photographs | |
| Vintage Photos | Photos of German bikes in period; WWII. |
| Modern Photographs | |
| Modern Photos | Modern photos of German bikes and historical clones. |
| Specialty Photographs | |
| Specialty Photos | Photos of German bikes with unusual accessories or trick riding. |
| Video Links | |
| Motorcycle riflemen | Propaganda film of motorcycle infantry combat operations. |
| Trick riding | Reenactor engages in some pretty cool trick riding. |
| Reenactor convoy | Convoy of BMWs and Kubelwagens. |
| R-75 in the mud | BMW R-75 tackles a muddy trail. |
| KS 750 | Zundapp KS 750 with trailer train. |
| Zundapp | Video of a well restored Zundapp. |
| General Interest Links | |
| Oldtimer gallery; BMW R71 | Great photos of BMWs as well as all sorts of other WWII vehicles. |
| John's Beemer Garage | Tons 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.