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<DIV><FONT face=Arial size=2>I love the YS engine design, no doubt it produces
the "flavor" of power most easily managed by most in a pattern ship. It is a
miniature mechanical marvel, to think it's footprint hasn't changed since it's
introduction as a lowly 120 small bearing, small exhaust valve, over compressed
SF. However, that is part of the problem, the design was probably at it's peak
in 140 FZ and/or L form. It could withstand somewhat minor QC issues and believe
me, if you've ever measured YS parts in bulk, there are QC issues. I still have
2 YS 120AC's, dinosaurs to some but good running engines for 10 pound planes
that thrive at quiet rpms ( 7600 to 8000 ). However I have switched to the dark
side, OS 2 cycles as they are lighter, easier to maintain ( less parts ), with
out a doubt more powerful and OS'es QC is first class. The current crop of
YS 4 cycles shake very hard, consume too much fuel, have to be run at a nosy rpm
range and quite frankly are unreliable for the average pattern flier, although
unreliable can be said about OS, Mintor and Webra too, depends on who you
talk to. Unreliable in the 2 stroke seems to be the learning curve of pipe
length to prop load issues. To be honest, the only 100% trouble free YS engines
I have ever owned were ones I blueprinted, modified and lovingly
hand assembled for myself and those I built engines for in the Northeast
including a past Nats Master's champion. </FONT></DIV>
<DIV><FONT face=Arial size=2>Ed M.</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=mups1953@yahoo.com href="mailto:mups1953@yahoo.com">mike mueller</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, September 28, 2004 7:51
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: YS 160 DZ</DIV>
<DIV><BR></DIV>
<DIV> Troy I've made a few observations about the YS engines after using
them for 3 out of the last 4 years. We have what I believe to be the largest
pattern club in the country here in Chicago with at least 15 dedicated flyers
at our home field almost all use YS product.. </DIV>
<DIV> I think the YS DZ is the most powerful engine available today I
also think they are very unreliable. We've had over a 60% failure rate this
year alone with the DZ's being used here. When they run they are awesome and
that's what keeps most of us here willing to fight thru the problems. We have
had a lot of problems with the pumps. One of our sponsored flyers went thru 3
pumps on 1 engine this summer. These are people who have strong relationships
with Verano. </DIV>
<DIV> I have had a very good engine this year but it has continued to
break head gaskets all year long and it leaks fuel to the point of being
nicknamed the "Exxon Valdez". She's going back to the factory this week.</DIV>
<DIV> I hope that YS takes there time with the release of the 160DZ and
makes them more reliable. One of our really top flyers here has had so many
problems with his 2 DZ's this year that it all but ruined his season. The guys
a top auto mechanic and he knows engines.</DIV>
<DIV> I'm going to stick with the DZ because I think it's like F1 racing.
On the edge! Still one should know what there getting into with these
expensive, finicky and complicated buggers.</DIV>
<DIV> Also I know that our group has enough mechanical smarts to setup
and run engines correctly. I'm hoping for the best here. Thanks,
Mike<BR><BR><B><I>Troy Newman <troy_newman@msn.com></I></B> wrote:</DIV>
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<DIV>Mike,</DIV>
<DIV> </DIV>
<DIV>I have not seen the MA ad yet, but I do know that Yamada was playing
with some new pump designs. This was a two fold deal: #1 make the pump
easier to produce (less $$ and less hassles) and #2 to make the pump a more
user friendly easier to adjust version. Now with this re-design I believe
they found out some things in the longevity side of the equation and these
applied to the std 140DZ pump. Then the 140DZ pump got an upgrade
and met the goals of the new pump design and kept the parts the same in
terms of looks. My original 160 DZ has the same pump as the 140DZ. </DIV>
<DIV> </DIV>
<DIV>I have run both pumps and they run the same. Then again I don't tend to
have problems with my motors. They just run and run and run. I actually wear
them out after hundreds of flights. </DIV>
<DIV> </DIV>
<DIV>TN</DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=Zoro1024@aol.com
href="mailto:Zoro1024@aol.com">Zoro1024@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, September 27, 2004 8:19
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: YS 160 DZ</DIV>
<DIV><BR></DIV><FONT id=role_document face=Arial color=#000000 size=2>
<DIV>Kind of wonder myself, I see their add in the AMA magazine shows a
different pump arrangement. Something has got to make them better,
I've become the postman's best friend mailing the 140's back to NV.</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>Mike</DIV></BLOCKQUOTE></FONT></BLOCKQUOTE>
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