| 2004 |
Jul 25 |
Kenworthy's Motocross Park National MX R7 |
— |
— |
| 2002 |
Jul 14 |
Kenworthy's Motocross Park National MX R7 |
— |
— |
| 2001 |
Jul 22 |
Kenworthy's Motocross Park National MX R8 |
— |
— |
| 2000 |
Jul 23 |
Kenworthy's Motocross Park National MX R8 |
— |
— |
| 1999 |
Jul 25 |
Kenworthy's Motocross Park National MX R8 |
— |
— |
| 1998 |
Jul 25 |
Kenworthy's Motocross Park National MX R8 |
— |
— |
| 1997 |
Jul 27 |
Kenworthy's Motocross Park National MX R9 |
— |
— |
| 1996 |
Jul 28 |
Kenworthy's Motocross Park National MX R9 |
— |
— |
| 1995 |
Jul 16 |
Kenworthy's Motocross Park National MX R7 |
— |
— |
| 1994 |
Jul 24 |
Kenworthy's Motocross Park National MX R8 |
— |
— |
| 1993 |
Jul 25 |
Kenworthy's Motocross Park National MX R7 |
— |
— |
| 1992 |
Jul 26 |
Kenworthy's Motocross Park National MX R6 |
— |
— |
| 1991 |
Jul 28 |
Kenworthy's Motocross Park National MX R6 |
— |
— |
| 1990 |
Jul 29 |
Kenworthy's Motocross Park National MX R7 |
— |
— |
| 1989 |
Jul 16 |
Kenworthy's Motocross Park National MX R7 |
— |
— |
| 1988 |
Jul 31 |
Kenworthy's Motocross Park National MX R10 |
— |
— |
| 1987 |
Aug 9 |
Kenworthy's Motocross Park National MX R11 |
— |
— |
