Replacing this consumable in line with the service schedule will help the volume of Fuel-Air ratio remains at its optimum setting. A clogged up filter, which happens surprisingly quickly in dry dusty climates, will result in an engine running too rich, not causing damage in the short term, but taking the edge off performance, and especially affecting economy, a bit like riding with the choke partly on. Please take time to browse the online catalogue for these machines, this will help you find more service and spares that you may have overlooked.