Coventry Bees co-promoter Colin Pratt has resigned from his position at the Elite League side.
Pratt has been at Brandon Stadium after 15 years, in which time he helped the side to the 2010 Elite League title.
However, he has decided to leave because of differences between himself and the club's owners.
"Things weren't working out so I decided it was time to part company. I can't leave without thanking the supporters, staff and riders," he said.
"They were always the most important people to me and I thank them for their support over the years."
Bees owner Mick Horton took over the Bees in November last year, and was grateful for the work of Pratt during his successful tenure as time as co-promoter with the club.
"I want to pay tribute to the work he has done for Coventry over 15 years. I have nothing but praise and admiration for him - he has been 100% Coventry Speedway for the best part of nearly two decades," said Horton.
"Colin says he hasn't always been totally happy with the way things have been done, and I think that's probably a reflection of the fact that sometimes it can be very difficult to accept change.
"When a new owner comes in, and puts a lot of his own money in, many of the major decisions are going to rest with the owner, and maybe Colin found it difficult to let go in that respect."