As usual KTM have made another exciting 250 two stroke suitable for trail or Racing.   As standard a great bike.    Adding a pipe and head  makes the engine rev harder and hold gears longer. ECU reflash works great.  Inside the engine clearance from piston to conrod is very close,   over reving the engine or assembly of incorrect parts will result in engine damage.   Take care when working on this engine!  A great model , fun to ride, handles well, and lots of controlled horsepower .