Tuned engines will be allowed again at the two sidecar races at T.T. 2014.
Organisers have decided to return to "Open Class" regulations after talking to many of the competitors.
For the last two years, crews were not allowed to run tuned engines in their outfits in an effort to bring costs down.
However, after consulting with the teams, operating budgets appear not to have signicantly reduced.
Swim team setting records and gaining fans
strong performances all round
LIVE: 2026 Commonwealth Games
Live coverage from Glasgow from 23 July to 2 August
CWG: Busy day for Team Isle of Man in Glasgow
Manx records broke by Isle of Man's swimmers
Cycling event to bring road closures
Gran Fondo returns this weekend with new off-road format