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<DIV>
<DIV>Patrick</DIV>
<DIV> </DIV>
<DIV>From your descrition, I at first thought that you might be having a
fuel clunk problem in the tank, simply from having problems while
inverted.</DIV>
<DIV>But, you also state that it does the same thing during harriers, which puts
all the fuel around the clunk. I suspicion that your idle mixture
is</DIV>
<DIV>slightly lean. That's what I would try first... Just open
the mixture screw 1/8 turn or a bit more. If that doesn't work,
check the clunk "line" </DIV>
<DIV>in the fuel tank, it may have a perforation in it. Also, check the
gasket between the carb and the manifold for air leaks.</DIV>
<DIV>If all of these fail, pull out the low speed air screw and blow air
from an air compressor through it. Don't use more than about 30 lbs. of
pressure</DIV>
<DIV>Sometimes, there's a little junk in the jet passages that causes a few
problems, usually a result of not using an air cleaner, or the air cleaner
gets</DIV>
<DIV>junk through it. Reguardless of everything mentioned, your problem is
"too lean" in the low speed department.</DIV>
<DIV> </DIV>
<DIV>You didn't say wether or not this is a new engine... Even if it is
new, don't discount having junk in the carb. I've been making a
living with </DIV>
<DIV>chainsaws for over 20 years, and I'm here to tell you... You
wouldn't believe what you'll find in a new motor or carb... A lot of
times, drillings</DIV>
<DIV>never get blown out of the passages during assembly. Most all gas
engines any more are very stable, well running motors once set up</DIV>
<DIV>correctly. </DIV>
<DIV>I hope this helps, let us know what you find...</DIV>
<DIV> </DIV>
<DIV>Rex</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="FONT: 10pt arial"><B>From:</B> <A
title=mailto:ppandelaers@pandora.be
href="mailto:ppandelaers@pandora.be">PPandelaers</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=mailto:mini-iac@yahoogroups.com
href="mailto:mini-iac@yahoogroups.com">mini-iac@yahoogroups.com</A> ; <A
title=mailto:gsal@yahoogroups.com
href="mailto:gsal@yahoogroups.com">gsal@yahoogroups.com</A> ; <A
title=mailto:nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, February 25, 2007 7:07
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [NSRCA-discussion] ZDZ mixture
change when I fly on the back</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi all,</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Have a mixture issue which I
suspect more of you may have experienced, maybe someone knows a cure.
</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Running a ZDZ 80 RV in a Yak 54.
Prop is a Mejzlik 26x10. MTW-cannister. Turns about 6200
RPM.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Engine picks up wonderfully, does
great 3D. but, on in back-flight, the RPM sags a lot from mid- to high-range.
Don’t get full power at all. Flip it around, immediately full power. From
Back-flight, certainly from harrier, if I push it up for a torque, the engine
hesitates big time but never quits.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">All in all, I run the engine
fairly rich, it seems to be very tolerant to mixture setting as long as it’s
on the rich side. I have tried to lean it out to fix the back-flight issue,
but then it doesn’t pick up as well for 3D.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hope someone can
help.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Happy Landings
;-))</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN lang=EN-GB
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Patrick</SPAN></FONT></P></DIV>_______________________________________________<BR>NSRCA-discussion
mailing
list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</BLOCKQUOTE></DIV></BODY></HTML>