Any hopes a last minute compromise would allow the Mid-Antrim 150 races to go ahead have been snuffed out.
The organising club has upheld its decision originally made in December.
They say there are still major differences between the club and the Motor Cycle Union of Ireland.
T.T. star Adrian Archibald says it's a blow to his sport in Northern Ireland:-
Rugby: Manx club's passionate plea for new players
Western Vikings keen to bring in new additions to club and sport
Football: Castletown beat southern rivals to go top of Division 2
Peel win nine-goal thriller at Laxey in the premier league (Results: 25 Oct)
Rugby: Douglas continue strong run at Birkenhead Park
Western Vikings win close-fought Manx Shield encounter
Hockey: Valkyrs B move to the top of Mixed Division One
Two Island national sides take EH Championship wins
