Gary ---OS-- spent millions of dollars testing engines to get the right size bleed hole . So you drill it out cause you know better !!!!!!!!!!!!! Borrow some castor from a fellow flyer and beef up you fuel. Now put the idle bar plug in. Stick a pin in the bleed hole and screw in bleed screw till it just touches the pin. The bleed hole should be half plugged now. Leave it alone now. Open high speed about 3 turns and go for it. Set your HS needle for WOT and point plane in the air for lean test.