The 153cc single-cylinder, four-stroke, liquid-cooled SOHC two-valve unit employs a host of low-friction technologies to improve efficiency in terms of output and economy.

The overall weight and physical dimensions of the engine have been minimized to allow a greater packaging choice around it for a variety of platforms to come.

A compact combustion chamber, fed fuel/air mixture precisely by PGM-FI fuel injection, optimises burning velocity and cooling performance, tailoring torque characteristics to suit the rpm ranges typically used by a small capacity scooter rider

Smooth and extremely quiet starting is achieved by the electronically-controlled ACG starter and a decompression mechanism that reduces cranking resistance due to compression