Brand new aftermarket performance air filter, universal fits for most motorcycle air filter with 41mm / 42mm / 43mm engine inlet. For most Off-road motorcycle, atv, quad, scooter, go kart, moped, pit bike, dirt bike, racing bike or super bike. For mid-sized engines 125cc-250cc 2-strokes or 4-strokes engines, GY6 engines. Fits most carburetors (PZ24 150cc and PZ30 CG 250cc etc) requiring a 42mm (1.65in) inside diameter opening. Fit most Chinese import Pit / Dirt bikes, almost all of the bike brands from China, such as TaoTao, Buyang, Coolsport, Jonway, Znen, NST, BMX, Kazuma, Sunl, Roketa, AIM-EX etc. Following motorcycle models are for reference only, please measure your carburetor’s mouth outer diameter before you buy: Honda CB650, Kawasaki KH400 KZ440 KZ900A Z1 /A/B-900 KZ1000, Suzuki GT380 GT550 GS750 GS1000, Yamaha RD250 RD350 RD400. [NOTE]We provide 90-DAY MONEY BACK GUARANTEE & 1 YEAR WARRANTY. We guarantee to REFUND your money or REPLACE if you encounter any prob