GY6 Air Filter Intake Tube Air Filter Intake Tube for 150cc and 125cc GY6 4-stroke QMI152/157 QMJ152/157 engines.Please Note: This part is a common failure point on vehicles with a GY6 engine. Please check for dry rot, rips, and tears before riding. Upgrade to an All Aluminum Intake and After-Market Air Filter (Please check related items). Air Filter Side (large side) Inner Diameter: 79mm Carburetor Side (small side) Inner Diameter: 43mm Overall Length (including bend): 24 inches