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The exhaust camshaft assumes a control function for the decompression of the cylinder. At a low rotational speed of the engine, the exhaust camshaft briefly lifts the exhaust valve during each stroke, so that the compressed air can exit and the engine starts easier. At higher rotational speeds, i.e. when the engine is running, centrifugal force turns the decompression cam into an ineffective position and the compressed air cannot exit. The part is hot forged, machined, induction hardened, hard machined and then mounted ready for assembly with two other supplied components.