Fit for GY6 – 125cc/150cc 4 stroke 152QMI/157QMJ engines. Compatible for scooter, ATV, go kart etc. Suitable for scooter model like Eaglecraft Znen Tank Retro Agility Taotao Lance Vintage BMS Baja Jonway Vento Shenke Carbide Quantum Zircon Helix Manco American Sportworks Tomerlin Crossfire Dazon Raider Carter Talon Specification: Inner Diameter (bell): 125mm / Outer Diameter (bell): 137mm / Number of Splines: 19 / Splines Inner Diameter (peak to peak): 13.6mm / Outer Diameter (pulley): 142mm (5.6 inches) Product Description Fit Model: Agility125 150 4 stroke Taotao 125 150 4 stroke Lance Vintage 150 Eaglecraft 150 Znen 150 Tank 150 Retro 150 BMS 150 Baja SC125 SC150 Jonway 150 Vento 150 Shenke 150 Yerfdog GX150 Spiderbox 150cc such as 3206/4206, 3209/4209, 32092/42092, 32093/4209, 42054, 42094, 42101, 42105 RidgerRunner II Hammerhead GTS 150 Hammerhead Twister 150 Coolster 3150DX2 Kandi 150 Carbide 150 Quantum 150 Zircon 150 Helix 150 Manco 150 American