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.
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Free sidecar entries at July ARA meeting
Club says move aimed at supporting class amid uncertainty
Dunlop delivers again to win Supersport TT Race 2
Ballymoney man racks up 35th victory in dominant showing
Thousands raised to support family of Daniel Ingham
Rider died following TT qualifying incident last week
TT 2026: Three races due to take place today
Supersport, Sportsbike and Senior Races all on the schedule