Inside the cylinder with a bore of 95mm, an extremely lightweight bridged-box-type piston delivers a major contribution to the engine's low vibrations and engine-speed strength. The compression ratio is 12.6:1. Optimized for 2013, a new piston pin delivers more durability.
Inside the 450 SX-F engine's cylinder head, an overhead camshaft controls four ultra-lightweight titanium valves via extremely rigid rocker arms which are DLC-coated on the intake side. This configuration allows engine speeds up to 11,500rpm, a major contribution to the unique performance of the large displacement KTM engine. In 2013, a new three-layer head gasket is used that guarantees more durability under the most extreme conditions. In addition, the camshaft has received a strengthenend auto-decompression mechanism.