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Unless I find something obvious I may need to swap major portions with
a well running motor to find the offending part. At this point that
will have to wait for some test stand running (and more fuel)<br>
Thanks,<br>
Stuart<br>
<br>
Ken Velez wrote:
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<div>Not that I know all about YS but I would be looking for an air
leak. Something is opening a gap or separating when the engine gets hot
making it hotter and loosing throttle response. I know you have check a
lot of things but check for loose screws or broken head look at the
carb needle o-ring or the throttle butterfly seal for a split or the
screw in the back of the carb for tightness. I don't think it is
internal to the engine but with so many possibilities?? I once found
that grabbing the motor to loosen a head bolt I actually dislocated a
pushrod housing from the o-ring. Every looked ok but it was leaking air
thru it. Just my thoughts,</div>
<div> </div>
<div>Ken</div>
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<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">-----
Original Message ----- </div>
<div
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<a moz-do-not-send="true" title="RUDDERCABL@aol.com"
href="mailto:RUDDERCABL@aol.com">RUDDERCABL@aol.com</a> </div>
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>To:</b>
<a moz-do-not-send="true" title="nsrca-discussion@lists.nsrca.org"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>
</div>
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Sent:</b>
Tuesday, July 15, 2008 10:15 PM</div>
<div
style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Subject:</b>
Re: [NSRCA-discussion] 120 AC issues Not the Piston</div>
<div><br>
</div>
<font id="role_document" color="#000000" face="Arial" size="2">
<div>
<div>In a message dated 7/15/2008 3:15:33 PM Eastern Daylight Time,
<a moz-do-not-send="true" href="mailto:schale@optonline.net">schale@optonline.net</a>
writes:</div>
<blockquote
style="border-left: 2px solid blue; padding-left: 5px; margin-left: 5px;"><font
style="background-color: transparent;" color="#000000" face="Arial"
size="2">exchanged the piston and ring for a brand new one out of an
unrun <br>
motor. Basically no change. So either both pistons are bad or it is <br>
something else.<br>
I pulled a motor that ran fine out of my Asteris Omen. Motor has
little <br>
time after a Futaba warranty rebuild way back when. Most of the <br>
internal parts were new. It ran fine when I started flying again 3 <br>
years ago. Put it in the Dalotel and ran it for 7 minutes no issues.</font></blockquote>
</div>
<div>Stu</div>
<div> </div>
<div>Aparently , it wasn't the pipe as I had suggested. Have you
checked the fuel line inside of the tank and the clunk ? </div>
<div> </div>
<div>I wish you hadn't fallen into the fuel trap. 30% heli fuel
isn't the answer for all YS engines. Remember , the AC engines were
around long before that fuel and ran great without it. Any high quality
20 or 25 % all synthetic fuel should run just fine.</div>
<div> </div>
<div>Robert</div>
</font><br>
<br>
<br>
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