In the cylinder head of the 450 SX‑F engine, an overhead camshaft actuates four ultra-light titanium valves via extremely stiff, DLC-coated rocker arms on the intake side. This configuration allows engine speeds of over 11,500 rpm to be achieved and makes a major contribution to the unique performance of the high-capacity KTM engine. A new, three-layer, cylinder head gasket has been fitted for the 2014 model year, which guarantees even greater durability in the most extreme conditions. Furthermore, the now lightened camshaft has a strengthened auto-decompression mechanism at its disposal.
In the cylinder with a bore of 95 mm, an extremely light, box-in-box, forged piston works away, making a significant contribution to the engine's low vibration level and engine-speed strength on account of its low weight. The compression ratio is 12.6:1. Optimised for the 2014 model year, the piston pin ensures even greater durability.