M 66

1973 Ural M 66 Technical Analysis & Specification Breakdown

At the heart of the 1973 Ural M 66 classic motorcycle, Ural utilizes a 650 cc (39.7 cu in) air-cooled two cylinder boxer, four-stroke layout. In factory specification, peak output is rated at 32 HP (23.4 kW) at 4,500 rpm, transferring power to the rear wheel through a 4-speed gearbox and shaft drive (cardan) final drive. With a specific output of 49.2 HP per liter, the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.

On the scales, the M 66 measures 215 kg (474 lbs) wet (curb), translating to a power-to-weight ratio of 0.15 HP/kg (6.72 kg per horsepower). The 21-liter (5.5 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 125 km/h (78 mph).

Within MotoLibrary's Ural archive, this model family spans 3 indexed model years from 1973 to 1975, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.