Ka cika wannan jumla: Kemboi yana cikin tawagar 'yan gudun 4x400 da suka zama na biyar a gasar cin kofin duniya ta 1991. Ya yi gasa a gasar Olympics a karo na farko a wasannin Olympics na 1992, yana shiga cikin mita 400, inda ya kai wasan kusa da na karshe. Ya kuma kasance wani bangare na Kenya
4x400 relay team wanda ya ci gaba zuwa karshe, amma bai gama shi ba. A gasar cin kofin duniya ta IAAF ta 1992, ya kasance wani ɓangare na ƙungiyar Afirka 4 × 400 m da suka lashe zinare.