Bell-mouth for ET3 Polini air filter

Bell-mouth for ET3 Polini air filter 3d printed Mechanical parts
This replaces the mounting ring of the polini air filter for vespa smallframe 19/19 carbs. The elliptical bell shape smooths and greatly increases the airflow. It will be required to rejet due to the much greater airflow. On our test bike we went from a 74 main jet to a 108. This design also has a serrated texture around the outside allowing the filter a much better grip.
cm: 6.6 w x 6.6 d x 2.1 h
in: 2.598 w x 2.598 d x 0.827 h


  • White Strong & Flexible

    White nylon plastic with a matte finish and slight grainy feel.