400 WR

1990 Husqvarna 400 WR Technical Analysis & Specification Breakdown

At the heart of the 1990 Husqvarna 400 WR cross - motocross motorcycle, Husqvarna relies on a 395 cc (24.1 cu in) liquid-cooled single cylinder, two-stroke powerplant. In factory specification, peak output is rated at 17 HP (12.4 kW) at 5,500 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 43 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 400 WR measures 110 kg (243 lbs) wet (curb), translating to a power-to-weight ratio of 0.15 HP/kg (6.47 kg per horsepower). The 10.5-liter (2.8 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 110 km/h (68 mph).

Within MotoLibrary's Husqvarna archive, this model family spans 6 indexed model years from 1985 to 1990, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.