Inner diameter ??42mm ,adjustable 42 to 44mm,total length:80mm It fits manys Chinese CG 250CC ATVs Dirt Bikes. such as Taotao Coolster ATVs and Enduro SSR Coolster Dirt Bikes it fits Honda Kawasaki Suzuki Yamaha Bike 200cc 250cc ATVs Quad Dirt Pit Bikes GY6 125cc 150cc Scooter Moped Howhit 150cc Yerf dog Go Kart for PZ24 150cc and PZ30 CG250CC carburetor Product description Inner diameter ??42mm ,adjustable 42 to 44mm,total length:80mm 42mm Motorcycle Air Pod Filter for Honda Kawasaki Suzuki Yamaha Bike 250cc ATVs Quad Dirt Pit Bikes GY6 125cc 150cc Scooter Moped It fits manys Chinese CG 250CC ATVs Dirt Bikes. such as Taotao Coolster ATVs and Enduro SSR Coolster Dirt Bikes