June first marked the start of new bike season with KTM’s 2017 250 SX intro. The exciting news is that KTM is still investing in and developing its two-strokes, and this premiere class motocross bike is all new from the ground up, including a brand new engine with a new powervalve system and an emphasis on reducing vibration – a clear shot at the four-strokes on the track. We put in some laps and shot some video, and here are our first impressions of the bike.