The Honda Sonic is a 125 cc underbone designed for the South East Asian market by Honda. It belongs to the Honda Nova series of sports oriented underbone motorbikes produced since the mid 1990s. The Sonic is manufactured in Thailand by Honda Motors. Then it is exported to other countries of South East Asia such as Singapore, Laos, Cambodia and Vietnam. The Honda Sonic is unavailable in Malaysia and Philippines due to designs and safety regulations.
The Honda Sonic is fitted with the European CBR 125 4-stroke engine. It was adapted to liquid cooling due hotter weather conditions. The single-cylinder engine redlines at 10,500 rpm. This small engine utilize overbore design with bigger valve. It also has bigger carburetor with 28mm venturi diameter. Technical specification from AP Honda : 124.77cc Liquid Cooled 11:1 Compression Ratio Keihin AVK28 Vacuum Carburetor Max Power : 13.5PS@10000rpm Max Torque : 10.4Nm@7500rpm Most of ASEAN riders said that Honda Sonic is the fastest underbone for below 150cc class. It has more power compared to Yamaha T135LC although suffer smaller torque at low speed. It has better high speed acceleration and much faster top speed at 135-140km/h compared to 120km/h of Yamaha T135/Jupiter MX
The Honda Sonic comes in two models. One with mag wheels (RS Super), and one with normal wheels (RS). Both of these versions come with a mandatory kick start. The customer may choose to include electric start for an extra price.