Would you run the machine with the choke half on all the time - replacing the air-filter in line within the suggested service schedule will help ensure the machine does not run too rich, which tends to happen when the filter clogs up!
Renewing this Element Base when heat and vibration have taken its toll on the old item, may also make good sense.
CMS - where enthusiasts tend to buy their Japanese bike spares. Do you require any other similar parts - order in one lot to take the best advantage of our already low shipping costs!