U.F.O.
(Ultimate Flow Optimizer) PATENTED

AIR BLEED CIRCUIT

ONLY use air bleed when a 15 pilot jet is still too rich!

The air bleed circuit allows you to lean the pilot circuit without leaning the midrange and top end.

When your engine is running properly and your only concern is excessive fuel consumption or when you need to go leaner than a 15 pilot jet, the following drawing will show you how to improve your fuel mileage or lean out the idle circuit further by installing a small air bleed.  This is an extremely simple modification.  The size of the air bleed hole will determine to some degree what size pilot jet you run.  The #55 air bleed is installed in the needle jet only (not the needle) right next to the floor of the carburetor as illustrated in the drawing.  If you want to increase the size of your pilot slightly to throw more fuel across midrange, you may do this and still have the ability to lean out the idle circuit by enlarging the air bleed hole further than the #55 size.  We recommend that this be done cautiously in increments not exceeding 5 per time (example: #55 air bleed enlarged to #50).  Numbered drill bits get larger as the number decreases.  NEVER exceed #40 in size.