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.
Dixon keen to see FC Isle of Man response against Atherton LR
One point separates sides ahead of meeting at The Bowl
Hockey: Halfway point of mixed season approaches
All points paramount at both ends of all divisions at this stage
Rugby: Douglas back in action at Winnington Park
Vagabonds Ladies hoping to follow up big win at Aldwinians
Football: Sides looking to catch premier league top two
Castletown take slender Division 2 advantage into weekend
