It appears you're interested in specifications for the Thumpstar MX 50 JR. This Minibike, cross model is powered by a Single cylinder, two-stroke engine with 49.0 ccm (2.99 cubic inches) of actual displacement before compression. Fueling is metered via Carburettor. Mikuni 19mm allowing this machine to produce its horsepower and torque. According to our records engine heat of the Thumpstar MX 50 JR is moderated by . You'll need to get familiar with the transmission and pay attention to final drive maintainence. Our best information shows that the front tire size is and the rear is . The entire package is supported by the frame, Central-Tube Frame with Double-Cradle. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Single disc. Dual piston hydraulic disc front brakes and Single disc. Single Piston rear brakes. The Thumpstar MX 50 JR was launched in 2020, 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.