39mm Air Filter for 125cc 150cc 200cc ATVs Dirt Bikes Quad 4 Wheeler Pit Bike 125cc Go Karts 39mm Air Filter. Top Quality Guaranteed. 39mm Air Filter for 125-200CC ATVs, Dirt Bikes It fits most Chinese for 125-200CC ATVs, Dirt Bikes, 125cc Go Karts, please check pictures and specifications for compatibility Compatible with 22mm,26mm,27mm caliber of Pull Carburetor with Hand/Cable Choke; Inside diameter: 39mm; Higher air flow than normal filter for maximum power; Race tested for performance and reliability; Race filters increase air flow by up to 25% over standard filters; High quality ensured