The sealing rubber has been damaged, having been unable to perform the sealing of the drossel farce disc for this reason the maintenance specialists perform some works such as:

Cleaning the drossel flap disc.

Dismantling of sealing rubber and recording rubber.

Cleaning the tire socket before assembling new tires.

Mounting rubber recorder.

Adjustment of the sharp “blade” of the stainless steel support where the sealing rubber of the drossel farp disc is kissed.

Mounting the throttle disc hermetic rubber seal.