Kinesin motor protein which is required for the anterograde intraflagellar transport (IFT) along the middle segment of the sensory neuron cilia together with the kinesin II motor complex (composed of klp-11, klp-20 and kap-1) and on its own, is required for IFT along the distal segment (PubMed:17000880, PubMed:17420466). In addition, regulates the length of cilia (PubMed:17420466). May have a role during neurogenesis and axonal transport (PubMed:7714894, PubMed:7690265). Localizes along the full cilium length. Expressed in an exclusive set of 26 chemosensory neurons whose dendritic endings are exposed to the external environment; six IL2 neurons of the inner labial sensilla, 8 pairs of amphid neurons in the head, and 2 pairs of phasmid neurons in the tail. Worms are defective in osmotic avoidance, chemotaxis and dauer formation. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Kinesin family. Kinesin II subfamily.