Jan Kostwinder
Record type: Motorsport Biographies
Nationality: Dutch
Competed in
| Race | Position | Time | Speed | Machine |
|---|---|---|---|---|
| 1975 Senior TT | R | Yamaha | ||
| 1975 Lightweight TT | 38 | 1:41:59.00 | 88.79 | Yamaha |
| 1975 Junior TT | 27 | 2:01:44.00 | 92.98 | Yamaha |
| 1975 Classic TT | R | Yamaha | ||
| 1974 Ultra Lightweight TT | 6 | 1:19:48.00 | 85.1 | Yamaha |
| 1974 Senior TT | R | Yamaha | ||
| 1974 Lightweight TT | R | Yamaha | ||
| 1974 Junior TT | 33 | 2:00:50.20 | 93.67 | Yamaha |
| 1973 Ultra Lightweight TT | 2 | 1:17:21.60 | 87.79 | Yamaha |
| 1973 Senior TT | R | Yamaha | ||
| 1973 Lightweight TT | R | Yamaha | ||
| 1973 Junior TT | 14 | 1:59:58.60 | 94.34 | Yamaha |
| 1972 Lightweight TT | 21 | 1:41:35.00 | 89.15 | Yamaha |
| 1972 Junior TT | 15 | 2:07:40.80 | 88.67 | Yamaha |
| 1971 Ultra Lightweight TT | R | Yamaha | ||
| 1971 Lightweight TT | 21 | 1:42:42.80 | 88.18 | Yamaha |
| 1971 Junior TT | 26 | 2:33:15.00 | 73.87 | Yamaha |
| 1970 Ultra Lightweight TT | R | Yamaha |