The carb kit comes with a stock jet. When you replace the stock airbox with an open filter you have to rejet since you pull more air in. The only problem I can see with that filter is it is designed for running on paved surfaces. I see the filter clogging when running off road in dusty conditions. I would pull it and check the carb throat for any dirt especially after running on dusty dirt trails. The reason for oiling the filter is to trap the excessive dust particles which if allowed to be injested will act like sand paper in the cylinder and the guides. I use nothing but oiled filters but also use the outerware which is not oiled so when it gets dirty you just run under water if available and if not a good shaking will get most trapped dirt and sand out. Just make sure you check it frequently for some time cause it takes just a few hours to wipr out rings cylinders or guides. Let up know how it works.
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