The "K&N" air filters provide very good air flow, and are good for street use, but don't filter dirt very well.
So in dusty conditions they will allow a lot of dirt into your engine causing it to wear out quickly.
Aftermarket foam type filters are a good option, but need cleaning and re-oiling, so you'll need to carry the cleaner and oil. "Pipercross" have a good reputation.
Otherwise the original paper filter can be washed in soapy water, then rinsed and dried, and no oil required. But they take at least a few hours in the sun to dry out.
Another tip is to smear grease inside the airbox which will attract a lot of dirt and prolong the period before cleaning the filter becomes necessary.
When cleaning the filter, smear the grease around inside the airbox so the dirt mixes with it and it becomes sticky again.
Bob
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Remember that Assumption is the mother of all f**k-ups.
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