The Hustler 400 is the largest-displacement model in the Hustler series, which had previously ranged from 50 to 250 cm³. Based on the RN71, which won the 500 cm³ class of the Motocross World Championship in 1971, the Hustler 400 can be ridden on both city streets and off-road. The 400 cm³ 2-stroke 1-cylinder engine is equipped with an easy-to-use primary kickstarter and a decompression release mechanism. This engine is paired with a racing-style down type muffler. It also features the Pointless Electronic Ignition (PEI) system that ensures stable ignition performance at all times. Ceriani type front forks realize excellent riding stability.

Dimensions and weight	Dimensions	Overall length	2,215 mm
		Overall width	890 mm
		Overall height	1,100 mm
	Wheelbase		1,425 mm
	Weight		126 kg (Dry)
Engine	Engine type		2-stroke, 1-cylinder, air-cooled
	Engine displacement		396 cm³
	Bore x stroke		82.0 mm × 75.0 mm
	Maximum power		25kW(34PS) / 6,000rpm
	Maximum torque		41.2N-m / 5,500rpm
Transmission			5-speed constant mesh
Front tire size			3.25-19-4PR
Rear tire size			4.00-18-4PR