Polini Thor air box support problems

by Had Robinson

After a number of hours, the air box may slip down and become crossways on the carburetor.  When this happens air can enter the carburetor directly without being filtered by the air box.  The problem is that that support for the air box (that is attached to one of the upper cage sticks) slips down and the whole air box goes with it.  Tightening the air box clamp will not help.

The fix is easy.

Special materials and tools needed

1. Drill a 3/16" (5mm) hole on the side of the upper stick 3 3/4" (9.5cm) above the stick's joint with the main frame.

2. Put the washer on the rivet, the rivet in the hole, and secure the rivet to the stick with the rivet gun.

3. Use the cable tie and hose to support the air box.  The cable tie must be placed above the rivet which holds the tie (and air box) from slipping down.

Polini Thor airbox support modification

4. When reattaching the air box, note that the clamp must be placed so that it is NOT over the ridge on the outer end of the carburetor flange.  If it is, the air box will quickly slide towards the carburetor once the engine is running.