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.
Football: Laxey win to claim final Railway Cup spot
Castletown and Colby keep winning in Division 2
Rugby: Douglas win to go top of Regional 2 North West
Manx derby ends in rare goalless draw at Mooragh Park
Hockey: Valkyrs B snatch Mixed Division One title on final league weekend
Castletown Southerners escape relegation and send Vikings B down from top flight
Prestwich Heys pick apart FC Isle of Man
Ravens fall to joint-heaviest defeat of season so far
Boxing: Sam Rennie outclasses Rivo Rengkung
Manxman stays undefeated with win over experienced opponent