In short, some of the changes here include a shorter stroke, larger bore, a new cylinder head layout and a higher rpm range. The new 2013 also has larger ports, a bettered combustion chamber, larger intake valves and new camshafts. On the dyno, KTM claims a power increase of five horsepower. Harnessing all of this extra power are completely new engine cases that are made in a high-pressure die cast instead of a sand cast. This process allows the cases to be of a thinner wall thickness saving tons of weight.