Just got a new belt installed after some idler pulley issues & a shredded belt from some alignment issues. Idler pulley that got replaced is maybe a tiny bit smaller than the original pulley(0.25-0.5 inches smaller). The belt is the same size as before, but for some reason the new belt makes a repetetive thwacking/chirping sound for about a minute until its warmed up. once its warmed up, the sound is gone. The belt is a cog style belt and running it with an 8 rib setup/Vortech S trim. Any clues to why it would be making that sound until its warm?