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| 1980 |
| 1991 | 1.8 hp | 37 kg | 480 mm |
| 1992 | 1.8 hp | 37 kg | 480 mm |
| 1994 | 1.8 hp | 37 kg | 480 mm |
| 1995 | 1.8 hp | 37 kg | 480 mm |
| 1996 | 37 kg | 480 mm |
| 1998 | 37 kg | 480 mm |
| 1999 | 37 kg | 480 mm |
| 2000 | 3.3 hp | 38 kg | 480 mm |
| 2001 | 3.3 hp | 38 kg | 480 mm |
| 2002 | 38 kg | 480 mm |
| 2003 | 38 kg | 480 mm | US$1,099 |
| 2004 | 3.3 hp | 38 kg | 480 mm |
| 2005 | 3.3 hp | 38 kg | 480 mm |
| 2006 | 3.3 hp | 38 kg | 480 mm |