4-pin Voltage Regulator Rectifier. Version 8 This voltage regulator is the replacement part for many 4-stroke Chinese atvs, dirt bikes, go-karts and scooters. This regulator fits 50cc, 70cc, 90cc, 100cc, 110cc, and 125cc models. Check plug and pins to best match your part. Voltage regulator description: 4-pin [plug as pictured] Length: 72.5mm (2.8 in) Width: 51.2mm (2.0 in) Height: 26.2mm (1.0 in) 6.5mm (0.25 in) mounting hole Compatible with 50cc-125cc 4 stroke Known to fit Coolster 3150A, 3150B, 3150D, 3150DX and 3150DX-2 atvs. Known to fit Coolster 6150 go-kart. Known to fit Tao Tao EVO 150, Lancer 150, MaxPower 150, Phoenix 150, Pilot 150, Powermax 150 and Quantum 150 scooters. Shipping details: Do you need your voltage regulator fast? If you order before 3:00 pm CST, Monday thru Friday, your order goes out the same day. Buy now! Electrical parts are not returnable. Please double check before ordering.