ER-4n

2013 Kawasaki ER-4n Technical Analysis & Specification Breakdown

At the heart of the 2013 Kawasaki ER-4n naked motorcycle, Kawasaki utilizes a 399 cc (24.4 cu in) liquid-cooled twin, four-stroke layout. In factory specification, peak output is rated at 42.9 HP (31.3 kW) at 9,400 rpm while maximum torque reaches 37 Nm (27.3 lb-ft) at 7,500 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 107.5 HP per liter and a 1,900 rpm working window between peak torque (7,500 rpm) and peak power (9,400 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.

On the scales, the ER-4n measures 199 kg (439 lbs) wet (curb), translating to a power-to-weight ratio of 0.22 HP/kg (4.64 kg per horsepower). Rider ergonomics and chassis geometry center around a 790 mm (31.1 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,410 mm (55.5 in) wheelbase engineered for quick, flickable steering geometry. The 15.5-liter (4.1 US gal) fuel tank supports practical everyday commuting and weekend road stints.

Within MotoLibrary's Kawasaki archive, this model family spans 4 indexed model years from 2011 to 2014, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.