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<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=409102513-22092004>Hello
Bruce and Peter,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=409102513-22092004>As you
know, the regulator screw is both the idle and mid-range adjustment. A
tight (non worn-out) AC will idle beautifully with a rich regulator.
If it is only a little bit rich, then the engine will appear to
subtly richen at 1/2 throttle and full power in the air. You may not
even notice much of a rich transition, but this does happen. If the
regulator is set even more rich, then the idle-to-WOT transition will be slow
and blubbering rich.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=409102513-22092004></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=409102513-22092004>What
we need to know to help you better is whether the engine is definitely rich
during this slow transition. You can prove this by briefly pinching the fuel
feed line as you push the throttle up. Stay out of the prop's way as you
do this, as it may backfire lean and spit the prop off! If the pinch test
improves the transition, then lean the regulator 1/8 turn at a time, and reset
the needle valve at full throttle, each time. I have seen the
regulator screw run anywhere between one turn out from flush and
several turns in from flush with the housing. Put a fresh O.S. F type plug in
the motor, as well. </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=409102513-22092004></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=409102513-22092004>When
you say that it smokes a lot, does that mean while running (probably rich) or
after the engine stops (probably lean)?</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=409102513-22092004></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=409102513-22092004>Let us
know how it goes,</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=409102513-22092004> Dean Pappas</SPAN></FONT></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=Section1>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi
Peter,</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I am still having problems getting
my YS120AC to run properly, even after putting in a new piston and
ring.</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">The engine seems to idle okay, but
is sluggish to pick up revs, even after adjusting the needle. I have
replaced the regulator plunger and ring and fuel line, but no improvement. It
also smokes a lot in my opinion. Have you got any ideas!
</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Regards,</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><st1:PersonName w:st="on"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Bruce
Hunter</SPAN></FONT></st1:PersonName><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><A
href="mailto:jhbh@tpg.com.au">jhbh@tpg.com.au</A></SPAN></FONT><o:p></o:p></P></DIV></DIV></BLOCKQUOTE></BODY></HTML>