Checking from our catalogue, Honda engines doesn't have idler bearing. The timing belt uses belt tensioners to keep it tight and right on time.

Usually pinapalitan ang idler pulley or belt tensioner kasabay ng timing belt. And timing belt naman ang nagcocontrol ng cam shafts kung kailan bubukas at sasara ang valves para pumasok ang gas at hangin (intake valve) o para lumabas ang usok (exhaust valve).

HTH