A major Harley-Davidson shareholder is fighting to shake up the motorcycle maker’s board and quickly replace its chief executive in the face of deteriorating sales. In an open letter Wednesday, investment firm H Partners urged shareholders to remove three longstanding directors from Harley’s eight-member board at a coming annual meeting in mid-May.

Dourdeville is with H Partners, the second-largest investor in Harley. In his resignation letter, he cited “grave concerns” about the state of the company and its long-term outlook. He called for the immediate resignation of Zeitz and longtime directors Sara Levinson and Norman Thomas Linebarger.

Davidson's shareholders to remove three directors from the board, including its CEO, holding them responsible for the company's declining sales and falling stock price.