It appears you're interested in specifications for the Yamaha Smax. This Scooter model is powered by a Single cylinder, four-stroke engine with 155.00 ccm (9.46 cubic inches) of actual displacement before 11.0:1 compression. Fueling is metered via Injection allowing this machine to produce its horsepower and torque. According to our records engine heat of the Yamaha Smax is moderated by Liquid. You'll need to get familiar with the Automatic transmission and pay attention to final drive Belt maintainence. Our best information shows that the front tire size is 120/70-13 and the rear is 130/70-13 . The entire package is supported by the frame, . We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Single disc. Hydraulic. front brakes and Single disc. Hydraulic. rear brakes. The Yamaha Smax was launched in 2015, and we're happy to know (or assume) you've got one in your garage. To help you keep your ride in tip-top shape, consider purchasing an owner or service manual.