1990 Supersport 400 TT
Course name: Mountain (post 1914)
Course length: 113.19 miles (3 laps)
Competitors
| Position | Competitor(s) | Time | Speed | Machine |
|---|---|---|---|---|
| 1 | Leach, Dave | 1:03:02.20 | 107.73 | Yamaha |
| 2 | Fogarty, Carl | 1:03:10.40 | 107.5 | Honda |
| 3 | Ward, Steve | 1:03:14.20 | 107.39 | Kawasaki |
| 4 | Jefferies, Nick | 1:03:24.60 | 107.1 | Yamaha |
| 5 | Reid, Brian | 1:03:24.80 | 107.09 | Yamaha |
| 6 | Hislop, Steve | 1:03:53.00 | 106.3 | Honda |
| 7 | Cull, Steve | 1:03:54.20 | 106.27 | Kawasaki |
| 8 | Woodland, Barry | 1:03:58.40 | 106.15 | Yamaha |
| 9 | Moodie, Jim | 1:04:47.80 | 104.81 | Honda |
| 10 | Rea, Johnny | 1:05:59.80 | 102.9 | Suzuki |
| 11 | Chatterton, Derek | 1:06:52.00 | 101.5 | Kawasaki |
| 12 | Langton, Mark | 1:07:10.00 | 101.1 | Kawasaki |
| 13 | Bevan, Colin | 1:07:30.20 | 100.6 | Yamaha |
| 14 | Rose, Richard | 1:07:30.60 | 100.59 | Yamaha |
| 15 | Ives, Steve | 1:08:04.60 | 99.75 | Kawasaki |
| 16 | Duffus, Iain | 1:08:21.40 | 99.35 | Kawasaki |
| 17 | Petty, Chris | 1:08:34.80 | 99.02 | Kawasaki |
| 18 | Dugdale, Alan | 1:08:54.40 | 98.55 | Honda |
| 19 | Morris, Ian | 1:08:55.20 | 98.54 | Yamaha |
| 20 | Knight, Ray | 1:09:06.00 | 98.28 | Honda |
| 21 | Wheeler, Malcolm | 1:10:06.40 | 96.87 | Yamaha |
| 22 | Simmons, Bob | 1:10:08.40 | 96.82 | Honda |
| 23 | Price, Robert A. | 1:10:17.80 | 96.61 | Kawasaki |
| 24 | Stengl, Manfred | 1:10:25.80 | 96.42 | Honda |
| 25 | Berwick, Sandy | 1:10:35.80 | 96.2 | Suzuki |
| 26 | Clegg, Noel | 1:11:11.20 | 95.4 | Kawasaki |
| 27 | Bryan, Nigel | 1:13:14.60 | 92.72 | Suzuki |
| 28 | Allan, Robbie | 1:13:34.60 | 92.3 | Suzuki |
| 29 | Raybould, John | 1:13:57.40 | 91.82 | Suzuki |
| 30 | Donnan, John | 1:13:58.20 | 91.81 | Suzuki |
| 31 | Jenkins, Gerry | 1:14:50.00 | 90.75 | Yamaha |
| 32 | Kiddie, John | 1:15:25.00 | 90.05 | Yamaha |
| 33 | Catterall, Paul | 1:18:40.20 | 86.32 | Suzuki |
| R | Laycock, Eddie | Suzuki | ||
| R | Morris, Dave | Suzuki | ||
| R | Thrush, Gary | Suzuki | ||
| R | Glass, Derek | Kawasaki | ||
| R | Wallis, David | Suzuki |