yes, the bell should spin free. you should be able to spin it very easily with your fingers. It should spin as free and as long as a non driven wheel on an r/c truck with bearings (like the front wheel on a 2 wheel drive truck) there needs to be bearings in the center of the bell (an inner and an outer) along with the correct amount of washers for spacers. the reason the clutch bell needs to spin freely is because it's what keeps the truck from taking off as soon as you start it. when you give it throttle, the centrifugal clutch shoes come out, and make contact with the inside of the bell and that's what makes the truck move.