KTM 250 SX-F is one of the middle motocross series from KTM motorcycles, In 2005, KTM 250 SX-F was released to the market with almost 250cc of engine capacity, singe cylider, 4-strokes and also DOCH engine. You must to know that KTM 250 SX-F is KTM motocross racing series range in 2007, labeled with SX-F means it's racing bikes.Here is the basic engine from KTM 250 SX-F series
taken from KTM