So I'm guessing that the 40 series is just like the 20 series but wider. And that's what's wrong with it they torque converter or driver as you call it. By the way thank you for replying
I have a go-kart that has a 301cc predator engine. It looks like it has a new motor on it. It doesn't look like it has the right torque converter on it the belt doesn't touch each side or maybe something else is off. Any help would be appreciated