Foam filter Keeps engine clean inside Easy to replace Motovox uses this foam air filter for the Motovox MVS10 scooter Foam rings or sleeves such as this one do a superlative job at keeping the dirt & dust out of your carburetor and gas engine Motovox uses this foam air filter for the Motovox MVS10 scooter. Foam rings or sleeves such as this one do a superlative job at keeping the dirt dust out of your carburetor and gas engine. Easy to replace and at a price that can’t be beat, this is like cheap health insurance for the scooter.