It appears you're interested in specifications for the Suzuki Boulevard S40. This Custom / cruiser model is powered by a Single cylinder, four-stroke engine with 652.0 ccm (39.79 cubic inches) of actual displacement before compression. Fueling is metered via Carburettor. Mikuni BS40, single allowing this machine to produce its horsepower and torque. According to our records engine heat of the Suzuki Boulevard S40 is moderated by Air. You'll need to get familiar with the 5-speed transmission and pay attention to final drive maintainence. Our best information shows that the front tire size is 100/90-M19 and the rear is 140/80-M15 . The entire package is supported by the frame, Steel frame with tubular backbone. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Single disc front brakes and Expanding brake (drum brake) rear brakes. The Suzuki Boulevard S40 was launched in 2021, 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.