Agency Motocross August 13 1978Agency MotocrossSt. Joseph, MO 500MX Results 125MX Results Results Home 1978 Results Agency Motocross Live & On-Demand Learn More * all times Check back for a full broadcast schedule closer to the race. 1978500MXFull Results RexStaten1st MartySmith2nd RickBurgett3rd 1978125MXFull Results BrocGlover1st RonTurner2nd MarkGregson3rd