65 sx ktm: The Ultimate Guide for Young Riders The 65 SX KTM is a proper, race-ready motocross bike built for one crucial job: to be the perfect stepping stone for young riders graduating from 50cc automatics. It's the bike that introduces serious junior racers to a manual clutch, a six-speed gearbox, and the snap of a real two-stroke powerband, building the exact skills they need for a future in …