R51 Literature
| R51/2 | Road Test 1950 |
| R51 1937-40 | Technical Data |
| R51,R61,R66,R71 | Owners Manual |
| R51,R61,R66,R71 | Owners Manual - German |
| R51,R61,R66,R71 | Workshop Manual - German |
| R51,R61,R66,R71 | Parts List - German |
| R51/2 1950 | Owners Manual |
| R51/2 1950 | Spare parts List, illustrated |
| R51/3, R67/2 1951 | Owners Manual |
| R51/3, R67/2 1952 | Owners Manual |
| R51/3, R67, R67/2 | Workshop Manual—English |
| R51SS | Motorcycle Collector |
| R51/2 | Wiring Diagram |
| R51/3 - R67 | Wiring Diagram |
| Plunger Frame | Electrics |
| R51SS | Motorcycle Collector |