When it comes to Air Filtration there are really only 2 choices when it comes to Pro's. Uni and K&N. For dusty and sandy conditions Uni is the way to go. The filtration of a 2 stage foam filter is hard to beat, and with the fact that its a Genuine Uni, well....you know your getting the real deal. Don't chance an expensive engine to some no-name filter, go with the Uni!
This is the size to fit the 49cc Motoped.