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| 1977 | 26.5 hp | 88 kg |
| 1978 | 26.5 hp | 88 kg |
| 1979 | 26.5 hp | 86 kg | 950 mm |
| 1980 | 27 hp | 88 kg | 950 mm |
| 1981 | 30.5 hp | 88 kg | 950 mm |
| 1982 | 31 hp | 86.5 kg | 932 mm |
| 1983 | 31 hp | 86.5 kg | 932 mm |
| 1984 | 36 hp | 88 kg | 950 mm |
| 1985 | 36 hp | 88 kg | 950 mm |
| 1986 | 40 hp | 88 kg | 950 mm |
| 1987 | 36 hp | 88 kg | 950 mm |
| 1988 | 36 hp | 88 kg | 950 mm |
| 1989 | 36 hp | 950 mm |
| 1990 |
| 1991 |
| 1992 |
| 1993 |
| 1994 | 39.5 hp | 88 kg | 960 mm |
| 1995 | 39.5 hp | 88 kg | 950 mm |
| 1996 | 39.5 hp | 88 kg | 950 mm |
| 1997 | 39.5 hp | 88 kg | 950 mm |
| 1998 | 40 hp | 88 kg | 950 mm |
| 1999 | 40 hp | 88 kg | 950 mm |
| 2000 | 40 hp | 88 kg | 950 mm |
| 2001 | 41 hp | 86.5 kg | 940 mm |
| 2002 | 41 hp | 86.5 kg | 940 mm |
| 2003 | 41 hp | 86.5 kg | 940 mm |
| 2004 | 41 hp | 87 kg | 950 mm | US$5,099 |
| 2005 | 41 hp | 87 kg | 950 mm | US$5,099 |
| 2006 | 41 hp | 87 kg | 950 mm | US$5,099 |
| 2007 | 41 hp | 87 kg | 950 mm | US$5,099 |
| 2008 | 41 hp | 87 kg | 950 mm |