The Yamaha Aerox 155 has a 155 cc engine (about 155.1 cc displacement). It's a single-cylinder, liquid-cooled, 4-stroke unit with VVA (Variable Valve Actuation), making roughly 15 hp (11.3 kW) at 8,000 rpm and 13.9 Nm of torque at 6,500 rpm. No hidden fault