JESEL ALL THE WAY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I have one and love it, plus it looks kool . jesel says you dont want an idler pulley, makes sence too , nothing to move or wear out! just my 2 cents. would never think of useing any other, ther quiet, dont transfer harmonics to cam from crank, hold timing, andyou can adjust timing easy.David,