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ducati desmodromic valve system rocker shaft closing lobe opening lobe camshaft opening rocker valve closing rocker colored dark for illustration purposes camshaft rocker shaft opening rocker opening lobe closing lobe closing rocker forked tip valve note the full length of the rocker shafts and camshafts used in these illustrations has been shortened for purposes of clarity top view valve stem opening rocker opening rocker shaft camshaft opening lobe closing lobe forked tip rocker shaft closing rocker offset the closing rocker must have an offset tip because both of the rockers act on the same valve but each must be driven by a different camlobe on the same camshaft