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<DIV>All engines have their issues and pros and cons. I don't even open
any mail that is on YS, so maybe they are always about the same thing. I
don't know. But it sure seems that there's a lot of information on drilling out
this butterfly, removing that plug, lubricating the cam, swapping piston X
for Y, rebuilding whatever. </DIV>
<DIV> Like I said, its a ying and yang thing and some friendly
ribbing.</DIV>
<DIV> </DIV>
<DIV>--Lance</DIV>
<DIV> </DIV>
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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=Hotrod34a@aol.com
href="mailto:Hotrod34a@aol.com">Hotrod34a@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> Sunday, June 13, 2004 10:45
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Minto 170</DIV>
<DIV><BR></DIV>
<DIV><FONT face="Comic Sans MS" size=2><STRONG> You know, I
don't usually say to much and keep my mouth shut most of the time on this
list, but it's time someone spoke up on this issue. In the
last several months there has been several thousand posts on this
discussion group about 2 strokes, adjusting pipe length and tuning 2 strokes,
bearing issues, sealed vs not, stainless vs not, after market vs standard
factory bearings, gee, I got 200 flights on my stainless bearings vs 30
flights on the factory bearings, after run oil for 2 strokes, whether to use
it or not, whether to run them dry after flying or not, dual plug heads vs
single plug heads, and so on....</STRONG></FONT></DIV>
<DIV><STRONG><FONT face="Comic Sans MS"> In the last several
months I have only seen less that a dozen posts about a YS engine, and most of
those were how to type questions, not problem issues. Last week there
was one post about which port to hook up the return fuel line to, and Don
Ramsey's problem with his YS. How do you figure that you could not get a
word in edgewise????? I guess that when some folks start flying 2
strokes, they forget how to count........As some would say....flame suit
on.......Larry.....</FONT></STRONG></DIV>
<DIV><FONT face="Comic Sans MS" size=2><STRONG></STRONG></FONT> </DIV>
<DIV><FONT face=Arial size=2>Brian,</FONT></DIV>
<DIV><FONT face=Arial size=2>Interesting ying and yang here on engines.
2 stroke tuning problems don't arise that often, and<FONT color=#ff0000> last
week you couldn't get a word in edgewise for all the YS
blues!!</FONT></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>it's not common that the midrange would be lean,
especially on the full Mintor setup. I haven't seen that. The pipe
is an essential part of balancing the mixture in a 2 stroke and I know the
Mintor pipe produces an even mixture, even if not top power. Please
check the engine cooling. This can significantly affect
performance. Fly with the cowl off for comparison. If there's a
difference, then maybe you need more exit area, or another hole in the bottom
of the chin cowl behind the engine. </FONT></DIV>
<DIV><FONT face=Arial size=2> If the engine is lean in
midrange it will get very hot in the air and this is not good. I've seen
one engine where the owner decreased teh pump pressure so much that it went
lean in midrange and he nearly burned it up. Are you still at the
factory pump setting? If you've decreased the pump pressure, then
increase it again. If you are flying 10%, then increase to 15%.
Some engines of early vintage prefer a bit more nitro. Another way to
richen the midrange is to shorten the header. This is not my first
suggestion though, because the factory setup works fine, however I've
experimented with doing this and found that the 170 will gain a lot more power
on a slightly shorter pipe at the expense of a richer midrange.
Normally, this is a bad thing.</FONT></DIV>
<DIV><FONT face=Arial size=2> I have had good luck with setting
everything a slight bit rich on the ground. This is not because I'm
expecting it to lean out in the air, but because I think it helps the engine
slow down faster and it doesnt' spool up on downlines. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>--Lance</FONT></DIV></BLOCKQUOTE></BODY></HTML>