Just two years after debuting an "all-new" motorcycle, KTM has once again reworked the 250 SX two-stroke with a number of new parts. The 2019 KTM 250 SX is built around the new steel frame that is all shared by full-size motocross machines in the KTM line, an updated engine that includes diecast cases and internal parts, and new settings for the WP AER 48 fork and shock. To learn more about the bike, we asked KTM North America's David O'Connor to get on camera for a quick run-through.