2019 YAMAHA XC155. 1 OWNER . ONLY 249 MILES. STREET LEGAL. SUPER CLEAN , ALWAYS GARAGED. The 2019 Yamaha SMAX (model code XC155) is a 155cc, fuel-injected, four-stroke, liquid-cooled scooter with an automatic CVT transmission. It features hydraulic disc brakes, 13-inch wheels, and a lightweight, rigid frame . The SMAX is offering a comfortable ride for both rider and passenger, a spacious floorboard, and enough power to handle commutes and highways, with a reported 75-81 mpg fuel economy and speeds up to 75 MPH.