1989 Supersport 400 TT
Course name: Mountain (post 1914)
Course length: 150.92 miles (4 laps)
Competitors
| Position | Competitor(s) | Time | Speed | Machine |
|---|---|---|---|---|
| 1 | Laycock, Eddie | 105.27 | Suzuki | |
| 2 | McGregor, Graeme | 1:27:21.40 | 103.65 | Suzuki |
| 3 | Woodland, Barry | 1:27:30.20 | 103.48 | Yamaha |
| 4 | Tuxworth, Neil | 1:29:06.60 | 101.65 | Yamaha |
| 5 | Oxley, Mat | 1:29:58.60 | 100.63 | Yamaha |
| 6 | Langton, Mark | 1:31:27.60 | 99 | Suzuki |
| 7 | Glass, Derek | 1:31:36.40 | 98.84 | Suzuki |
| 8 | Crawford, Neil | 1:31:58.40 | 98.45 | Kawasaki |
| 9 | Reynolds, John | 1:32:27.40 | 97.93 | Kawasaki |
| 10 | McMillan, Ian | 1:32:59.20 | 97.38 | Suzuki |
| 11 | Faulkner, Chris | 1:34:19.00 | 96 | Yamaha |
| 12 | Rutter, Tony | 1:34:19.80 | 95.99 | Suzuki |
| 13 | Wakefield, Peter | 1:34:55.00 | 95.4 | Kawasaki |
| 14 | Finch, Frank | 1:35:01.00 | 95.3 | Suzuki |
| 15 | Wallis, David | 1:35:02.60 | 95.27 | Suzuki |
| 16 | Madsen-Mygdal, Dave | 1:35:29.20 | 94.83 | Yamaha |
| 17 | Mason, Steve | 1:36:03.20 | 94.27 | Yamaha |
| 18 | Murray, Steve | 1:36:29.20 | 93.84 | Yamaha |
| 19 | Lucas, Malcolm | 1:36:31.80 | 93.8 | Kawasaki |
| 20 | Rae, James | 1:36:56.80 | 93.4 | Kawasaki |
| 21 | Morscher, Gerhard | 1:38:16.80 | 92.13 | Yamaha |
| 22 | Smith, David | 1:38:21.20 | 92.06 | Kawasaki |
| 23 | Trollope, Dennis | 1:40:42.80 | 89.91 | Yamaha |
| 24 | Simmons, Bob | 1:43:43.40 | 87.3 | Yamaha |
| R | Linscott, Mark | Kawasaki | ||
| R | Mawdsley, Kevin | Kawasaki | ||
| R | Bevan, Colin | Yamaha | ||
| R | Lougher, Ian | Suzuki | ||
| R | Ward, Steve | Kawasaki |