30 series asymmetrical belt or 40 series symmetrical V-belt? If it's a 30 series, it'll never work if you have the flat side of the belt riding on the moveable sheave. Read all of the text at the top of and all the way at the bottom of this linked page................ Comet Torque Converter Belts | Go Kart Drive Belts (gokartsupply.com)