Wide compatibility For GY6 engines Save money Easy installation This diode fits a veritable plethora of Chinese made 50cc, 150cc GY6, & 250cc based ATVs, scooters, and a lot more.Diodes allow the charging circuit to flow in only one direction, allowing alternator power to flow to the battery but will not allowing the battery to drain back through the stator.Description This diode fits a veritable plethora of Chinese made 50cc, 150cc GY6, & 250cc based ATVs, scooters, and a lot more.Diodes allow the charging circuit to flow in only one direction, allowing alternator power to flow to the battery but will not allowing the battery to drain back through the stator. ? WARNING California Residents: Proposition 65 Warning