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<DIV><FONT size=2>Hi Bob,</FONT></DIV>
<DIV><FONT size=2> Thanks for the reply. I am aware that
the idle adjust is an air bleed screw, thanks (sincerely) for the
reminder.</FONT></DIV>
<DIV><FONT size=2>The butterfly is closing completely, without the idle set
screw I can definitely get it to a closed position.</FONT></DIV>
<DIV><FONT size=2>I do not think air is getting in through the empty idle set
screw but that is a possibility, I have a new one</FONT></DIV>
<DIV><FONT size=2>comming from Central Hobbies next week. The tubing from
the front of the engine to the carb appears</FONT></DIV>
<DIV><FONT size=2>OK but I replaced it anyway. Right now my suspicions are
the diaphram or the idle set screw causing</FONT></DIV>
<DIV><FONT size=2>an air leak.</FONT></DIV>
<DIV><FONT size=2>Thanks,</FONT></DIV>
<DIV><FONT size=2>Paul</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=WHIP23@aol.com href="mailto:WHIP23@aol.com">WHIP23@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=phoran@vvm.com
href="mailto:phoran@vvm.com">phoran@vvm.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, May 15, 2003 7:27
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Fwd: YS 91 AC problem</DIV>
<DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 face=Arial size=2
FAMILY="SANSSERIF">In a message dated 5/15/03 5:09:08 PM Pacific Daylight
Time, <A href="mailto:phoran@vvm.com">phoran@vvm.com</A> writes:<BR><BR>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px"
TYPE="CITE"> Now the engine idles at approx 2500 but I cannot get it
below that even<BR>if I completely close the butterfly; also, the idle
mixture screw has no<BR>effect ! I notice air bubbles between the pump
body and the carb when<BR>idling, no bubbles in the tank side and there are
no bubbles at mid to high<BR>throttle. Only at idle.<BR> Any
ideas ?<BR>Thanks,<BR>Paul<BR><BR></BLOCKQUOTE><BR>Hi<BR><BR>First the idle
screw is an air bleed screw, not a mixture adjust, so it works reverse of
normal thinking (turning it in will richen, out will lean) Since it is
an air bleed and you indicate it has no effect, I would suspect an air leak
larger/more significant than the air bleed adjust. I don't remember the
layout on the .91, but the intake tube from the carb to the head is a prime
suspect on the 120/140's, but anywhere that it can suck air will distrub the
idle. I assume you have checked the obvious, like the butterfly is
really closing etc.<BR><BR>Bob<BR></BLOCKQUOTE></FONT></FONT></BODY></HTML>