Maxon Performance Go Kart 30 Series Drive Belt fit for Yerf-dog go karts 203591- Q430203W Comet Belt 203591A fits Comet 30 Series Torque Converters for 3 to 8hp engines. Belt fit for Yerf-dog #203591/Q430203W The asymmetrical cog belt used on all Yerf-dog go-karts with Tecumseh engines and belt. Width: 0.75 inch;Length: 29.25 inch; Driven torque-converters Pulley needs to be from 7 9/16 inch to 7 5/8 inch(6 Driven), or from 6 13/16 to 6 7/8 inch(7 Driven) (measured from the center of the clutch to the center of the driven pulley)