Similar to the GN250E, the GN125E is a cruiser style model equipped with a newly developed 4-stroke air-cooled 1-cylinder SOHC engine featuring a double spherical combustion chamber designed to enhance combustion efficiency and reduce fuel consumption. This engine incorporates a number of mechanisms and materials to further reduce weight, enhance durability, lower noise, and ensure maintenance-free upkeep. A maintenance-free ignition system was also realized by adopting a transistor-based contact-less ignition system.

Dimensions and weight	Dimensions	Overall length	1,945 mm
		Overall width	815 mm
		Overall height	1,110 mm
	Wheelbase		1,275 mm
	Weight		103.1 kg (Dry)
Engine	Engine type		4-stroke, 1-cylinder, air-cooled, SOHC
	Engine displacement		124 cm³
	Bore x stroke		57.0 mm × 48.8 mm
	Maximum power		9.6kW(13PS) / 9,500rpm
	Maximum torque		9.8N-m / 8,500rpm
Transmission			5-speed constant mesh
Front tire size			2.75-18-4PR
Rear tire size			3.50-16-4PR