Rear variator assembly for the Honda Tact 50: a driven pulley with a clutch. It transmits torque from the belt to the rear wheel and provides a smooth start.
Replace it if it slips, jerks at start-up, vibrates, or the clutch friction linings are worn. It often has to be replaced together with the belt.
After replacing it, check the assembly at idle and while riding: there should be no unusual noises, leaks, or play.
