The raised cam deal has the idler, mostly I suspect because there isn't a correct length belt that lets them use the same upper and lower as the standard. The funny thing is, the belts say DO NOT BACK BEND LOL..Which is exactly what an idler does.

Anyone remember the RINO jesel belt..? The belt to beat all belts. Put one on, cranked up the motor, and at idle SNAP!!!CLATTER CLATTER SCREECH HALT.

Those babies got may racers sideways with jesel.