A pivotal engineering highlight of the BMW R 60/6 (0251) was its introduction of the five-speed gearbox as standard equipment, a significant upgrade over the four-speed units of the previous /5 series. This refinement, combined with the transition to more modern switchgear and a standardized instrument cluster, cemented the /6 series as the bridge between the vintage ‘toaster’ era and the modern touring motorcycles of the late 70s.
| Quick Specs: BMW R 60/6 (0251) | |
|---|---|
| Production Years | 1973 – 1976 |
| Engine Oil | SAE 20W-50 (API SF/SG) (2.25 L) |
| Tires (Front/Rear) | F: 3.25 S 19 / R: 4.00 S 18 |
| Spark Plug | Bosch W7DC (NGK BP6ES) |
| Battery | 12V 25Ah |
| Tire Pressure (Solo) | F: 1.9 bar / R: 2.1 bar |
Engineering Overview
The R 60/6 occupies a unique niche in the BMW Boxer lineage. While its larger siblings, the R 75/6 and R 90/6, moved toward front disc brakes, the R 60/6 largely retained the 200mm twin-leading-shoe drum brake up front for several markets, offering a distinctively ‘classic’ feedback. Its 599cc horizontally opposed twin engine is renowned for its smooth power delivery and exceptional longevity, provided the Bing slide carburetors are kept in synchronization.
Maintenance Protocols
Lubrication System
For the air-cooled Boxer engine, thermal management is heavily dependent on oil quality. MotoSpecsLab recommends SAE 20W-50 meeting API SF or SG standards. The high zinc (ZDDP) content in these older specifications is crucial for protecting the flat-tappet camshaft. The total capacity is 2.25 Liters.
Chassis and Tires
Maintaining correct tire pressure is vital for the R 60/6’s stability, particularly when equipped with period-correct narrow rims. For solo riding, maintain 1.9 bar (27.5 psi) in the front and 2.1 bar (30.5 psi) in the rear. When carrying a passenger or luggage, increase the rear to 2.5 bar (36.2 psi) to prevent sidewall flex and overheating.
Electrical System
The 0251 model utilizes a 12V 25Ah battery. Owners should regularly inspect the charging system’s brushes and the diode board, as these are common failure points in the Bosch charging circuit. For ignition, the Bosch W7DC (or NGK BP6ES equivalent) remains the gold standard for consistent combustion.
Expert Verdict
The BMW R 60/6 is perhaps the most balanced of the /6 family. It avoids the ‘pinging’ issues sometimes found in the higher-compression R 75/6 while providing a more substantial touring experience than the earlier /5 series. It remains a premier choice for vintage enthusiasts who prioritize reliability and mechanical simplicity over raw horsepower.