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<DIV><SPAN class=300023011-29042006><FONT color=#0000ff><FONT face=Arial
size=2>Regarding the bearings, I recently contacted a local bearing supplier
(</FONT><A href="http://www.ebatmus.com"><FONT face=Arial
size=2>www.ebatmus.com</FONT></A><FONT face=Arial size=2> <FONT
color=#000000>1-800-666-6761</FONT>) after seeing they had the 6904LLU listed in
stock for $35.99 on line. The phone quote I received was $19. After
mentioning I could get these for $12 elsewhere, he agreed to sell them at that
price. </FONT></FONT></SPAN></DIV>
<DIV><SPAN class=300023011-29042006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN><SPAN class=300023011-29042006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=300023011-29042006><FONT face=Arial color=#0000ff
size=2>Anyway, when I went to pick it up, what he was selling was a generic copy
of the NTN (explaining the liberal pricing.) He assured me it was every
bit as good as the NTN.</FONT></SPAN></DIV>
<DIV><SPAN class=300023011-29042006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=300023011-29042006><FONT face=Arial color=#0000ff size=2>This
bearing had black seals instead of the orange and more importantly, spun very
easy compared to the NTN. I'm not sure if it's the grease or construction
on the NTN, but they have significant drag at room
temperature. </FONT></SPAN></DIV>
<DIV><SPAN class=300023011-29042006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=300023011-29042006><FONT face=Arial color=#0000ff size=2>So in
went the black sealed generic bearings (I did the front as well).
I've got ten flights now with them and both the power and fuel mileage has
gone WAY up (15 minutes yesterday on 15 oz of fuel, this same engine was
doing 10 minutes on 18 oz) Static RPM increased from 7,800
to 8,200. I'm liking it!</FONT></SPAN></DIV>
<DIV><SPAN class=300023011-29042006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=300023011-29042006><FONT face=Arial color=#0000ff size=2>The
only question remaining is whether they will hold up...
</FONT></SPAN></DIV>
<DIV><SPAN class=300023011-29042006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=300023011-29042006>Scott</SPAN><SPAN
class=300023011-29042006></SPAN></FONT></FONT></FONT></DIV>
<DIV><SPAN class=300023011-29042006><FONT face=Arial color=#0000ff
size=2>(Sorry, I failed to write down the markings before installing these
bearings)</FONT></SPAN><SPAN class=300023011-29042006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN></DIV>
<BLOCKQUOTE>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of </B>colin
chariandy<BR><B>Sent:</B> Saturday, April 29, 2006 12:13 AM<BR><B>To:</B>
NSRCA Mailing List<BR><B>Subject:</B> [NSRCA-discussion] OS140rx problems -
help needed.<BR><BR></FONT></DIV>
<DIV>Hello </DIV>
<DIV> </DIV>
<DIV>I started having problems with my 200-300flight old rx last season after
I lost my muffler ( Bolly 460) in flight. I decided to upgrade from
a muffler to an Aeroslave pipe. The motor ran poorly on the pipe and I
blamed the set-up. Poor midrange required that I back out the pump 3/4 and set
the top end a bit lean for reliable operation in the air. The setting would
change from one flight to the next. On the ground the engine
would load up and eventually quit 1/2 the time. I have now gone back to a
muffler ( Bolly 590) and the engines runs exactly the same as on the
pipe...very poor mid-range, erratic operation.</DIV>
<DIV> </DIV>
<DIV>Previous bearing replacement was the stock item put in 50 flights before
the problems started.</DIV>
<DIV> </DIV>
<DIV>I'm going to guess I need to replace the main bearing. What should I buy
and where? What else should I check/replace ? When should ring/sleeve be
replaced? Does anything else go wrong with these engines...pump problems
?</DIV>
<DIV> </DIV>
<DIV>All inputs are welcome.</DIV>
<DIV>Colin.</DIV>
<DIV> </DIV>
<DIV> </DIV>
<P>
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