K1 Build Advice

[Tobamory]

Just going through the motions with the K1, not had a belt drive before

Ive just completed fastening the 2 diffs to the chassis and securing the belt etc.
I had a questions

When I spin the belt should it be smooth or clunk a little. when I say clunk I mean like the teeth on the belt noise.

thanks in advance. just don't want it wearing out if it should be smooth as. although I cant see anything wrong, it may be out of align slightly

Rob