Plymouth Devils stayed four points adrift at the bottom of the Premier League after losing 54-41 to Rye House.
The Devils had to make do without new Italian signing Gino Franchetti, who was on Grand Prix duty in his homeland.
Ben Barker top-scored for Plymouth with 15 points while Ricky Wells grabbed 11, both from five rides.
"Rye House are very strong on their home track and we did well to score 41 points," said Plymouth promoter Mike Bowden after the loss.
"But who knows what might have happened if we had Gino in our side," he added.