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<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>Sounds like the prop slipped on the thrust washer like
Adrian stated. This can happen. Try one of the Central Hobbies large diameter
thrust washers...I used these when we ran the 140DZ's</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>The 160s and 170s changed the the thrust washer to make it
more aggressive bite on the spinner. The slip will happen then the
aggressive bite that is there gets smoothed off and then its tough to get it to
bite properly again.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>Another little trick is to tighten the prop...run the
engine a little and get everything heated up...then stop it...Tighten the prop
up again and lock the double jam nut down onto it. Your collet behind the thrust
washer can get compressed a little and it will actually slip if the engine
backfires. Its because the collet is compressed X number of times and the grip
on the taper is not as good. This is usually only a problem when the
when you have had the thrust washer off the engine and the first time you
tighten it back up. If the thrust washer has not been removed from the collet
then its probably not the issue...</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>We did the Central Hobbies thrust washer in order to give a
bigger diameter to bite the spinner.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2><A
href="http://www.centralhobbies.com/engines/ys/biggrip.html">http://www.centralhobbies.com/engines/ys/biggrip.html</A></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>It works well. Not trying to pimp the product but it was
designed to solve this problem and also the bigger hub 3D props had this problem
too. The 160's and 170's don't tend to suffer from this as much. The 140DZ
has a good bit of compression and tends to have a bigger kick....so the it can
throw the spinners loose more that the others. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>Another issue could be a little lean on the pump....this
would make it detonate a little on the throttle up. Try richen the pump just
a little bit 1/8th of a turn or so CW or (IN) if the engine is sounding a
little harsh or hollow when throttling up. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>Your choice of prop is good in that its not loading the
engine too hard. The higher loaded props will tend to spit harder when you run
it out of fuel or the engine starves and goes lean.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>Check you fuel filters..if they are clogged up then you can
get reduced fuel flow and it will make the engine go lean for a split second on
the throttle up. Its amazing what a small piece of lint can do. If your fuel
filter is the screw together type check it to make sure its tight and not
pinching the o-ring to allow an air leak.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>Fuel lines or tank can have a small air leak and get an air
bubble in the line causing the burp....If it burps in the air..check the prop
for tight the next you fly it. Chances are it might have slipped a
little.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>I have used about 60grit cloth backing sandpaper like
Adrian stated, Put two pieces back to back and CA them with thin CA and it makes
a good surface area grip. Another option is a small disk of aircraft ply like
1/8th soaked in thin CA with the sand paper on both sides. Tighten it to
compressed the wood then CA it again and then tighten the prop back
up.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>Like I said the 160's and 170's are lower compression
engines and don't tend to suffer from this kickback issue as bad. In fact I have
not had any problem with it the last few years. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>You can reduce the kick on the 140DZ by removing the crank
shaft ring. This will reduce the power a little but makes the engine run
smoother less vibration and less kick if it gets an air
bubble.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>Also are you running the YS Bubbless tank pickup (Foam
clunk) you should be if you are not already. Talked to a buddy today that was
running a 140 Sport and put a 140DZ in his model. The foam clunk seems light but
when it gets fuel in it the weight is proper to keep it in the fuel all the
time.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>As always check screws, on the carb, head bolts, backplate,
valve cover and so on. An air leak from a loose screw will make the engine go
lean. Not always kickback...but it could and be causing the
problem.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>I hope this helps.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2>Troy Newman</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=015382200-03062008><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <B>On Behalf Of </B>Lisa &
Larry<BR><B>Sent:</B> Monday, June 02, 2008 4:41 PM<BR><B>To:</B> 'General
pattern discussion'<BR><B>Subject:</B> [NSRCA-discussion] Question -
YS140DZ<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Ran the engine at home
about three weeks ago and perfect idle, midrange, and full throttle...
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">I went to the field
Sunday to maiden my Titan…Started as it usually does, and while it was at idle I
adjusted the transmitter to get it dialed in after my Tx repair / reprogramming.
This took about 15 to 20 seconds…Let it warm up a little longer and then slowly
increased rpm…About ½ throttle on the stick, somewhere between 5,000 and 7,000
RPM I heard a low freq buzz (sounded like an electric motor burning up…vbg)…shut
it down and found that the spinner loose (new spinner, new prop APC 16 x 11).
This is the set up I have flown with this engine for 3
years…<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Tightened up the
spinner making sure the prop was tight and started again and got a DZ
bump…nicked spinner, not bad…Tightened everything up again, started nice idled
well, then transitioned to full throttle. Again at half throttle, it popped,
quit, and shavings of prop flew every where. It was violent. The spinner is bent
worse than I ever saw before by anyone…The prop was intact except for the
missing chunks at the hub where it hit the spinner.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Starting procedures and
equipment:<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Radio South Starter
with on/off switch in the off position, using a Kavan starter turn the prop and
then turn on the Ni-starter. Temperature was about 20 degree warmer on Sunday
than the initial test run. Used the same fuel from the same can, Power Master
30% DZ<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Three weeks ago it was
running a bit on the rich side and I didn’t touch anything until Sunday when I
intended to lean it out…Never got that far.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">What did I do wrong if
anything? What can I look for in the engine to repair or correct myself or
looking at?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Or do I just send it in
to YS Performance?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">I have a back up 140DZ
and bought the last FAI 3-¼ TT spinner w/ light backplate at
Central…vbg…<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">If I made a mistake, I
don’t want to repeat it.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Your thoughts?
<st1:City w:st="on"><st1:place w:st="on">Troy</st1:place></st1:City> you out
there?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><st1:PersonName w:st="on"><FONT face=Arial color=navy
size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Larry
Diamond</SPAN></FONT></st1:PersonName><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT></P></DIV></BODY></HTML>