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| 1978 | 101 kg |
| 1979 | 35 hp | 101 kg |
| 1980 | 40.5 hp | 99 kg |
| 1981 | 40.5 hp | 101 kg |
| 1982 | 97 kg | 960 mm |
| 1983 | 97 kg | 960 mm |
| 1984 | 96 kg | 955 mm |
| 1985 | 96 kg | 955 mm |
| 1986 | 97 kg | 930 mm |
| 1987 |
| 1988 |
| 1989 |
| 1990 |
| 1991 |
| 1992 |
| 1993 |
| 1994 |
| 1995 | 51 hp | 98 kg | 955 mm |
| 1996 |
| 1997 | 51 hp | 97 kg | 950 mm |
| 1998 | 97 kg | 950 mm |
| 1999 | 98 kg | 950 mm |
| 2000 | 98 kg | 950 mm |
| 2001 | 98 kg | 950 mm |
| 2002 | 96 kg | 965 mm |
| 2003 | 96 kg | 965 mm |
| 2004 | 55 hp | 96 kg | 950 mm | US$5,999 |
| 2005 | 55 hp | 96 kg | 950 mm | US$5,999 |
| 2006 | 55 hp | 96 kg | 950 mm | US$6,099 |
| 2007 | 96 kg | 950 mm | US$6,099 |
| 2008 | 96 kg | 950 mm | US$6,099 |