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<DIV><FONT size=2>Bob,</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>The problem with the ring being tight in the groove occurred
as well on some </FONT></DIV>
<DIV><FONT size=2>of the old O.S. 60FSR's. I think O.S. sometimes works to too
close a tolerance.</FONT></DIV>
<DIV><FONT size=2>I like the clean machined finishes and general quality of
the O.S. products.</FONT></DIV>
<DIV><FONT size=2>To free up the ring you would have to get a piece of 600 paper
on a flat surface</FONT></DIV>
<DIV><FONT size=2>and try to sand the sides of the ring </FONT><FONT
size=2>smooth and free of machine marks by applying </FONT></DIV>
<DIV><FONT size=2>a gentle pressure with three fingers. If the ring is too
tight you will get surging at </FONT></DIV>
<DIV><FONT size=2>the higher revs. On some strokes the ring will seal and
on some strokes it will </FONT></DIV>
<DIV><FONT size=2>not and it looses the compression.</FONT></DIV>
<DIV><FONT size=2>Just as a matter of interest what type of fuel were you using
and also did you find that the O.S. 160 has enough power on a muffler to fly the
G.P. 300S ?</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Karl G. Mueller<BR><A
href="mailto:kgamueller@rogers.com">kgamueller@rogers.com</A><BR></FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV>----- Original Message ----- </DIV>
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<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=rcaerobob@cox.net href="mailto:rcaerobob@cox.net">Bob Pastorello</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">NSRCA</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, April 17, 2004 3:25
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Interesting Motor
Discovery-OS1.60</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Finally got around to getting the Wagstaff Extra
airworthy, after not being run for the winter. Felt rough, so tore it
down. Bearing was not really bad, although a little rust was present
(wasn't a SS bearing). Upon investigation, noting the serious lack of
compression, I proceeded to replace the bearing.</FONT></DIV>
<DIV><FONT face=Arial size=2> While the piston was out, of
course I cleaned it....lo and behold...RING rusted SOLID in the groove.
After careful working with my Amsoil spray, it freed, and I cleaned the
groove.</FONT></DIV>
<DIV><FONT face=Arial size=2> What was interesting was oil
on top of the cylinder, and on the cylinder wall (not a lot, but a film was
there)...and the side of the piston around the ring groove was bone
dry.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Fixed it all up, ran like a top, very smooth - so
shoudl be good to go. I have never seen a ring stuck like this before,
and just thought I'd share the tale in case anyone runs into inexplicable
roughness and low compression....</FONT></DIV><FONT face=Arial size=2>
<DIV><BR>Bob Pastorello<BR><A
href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A><BR><A
href="http://www.rcaerobats.net">www.rcaerobats.net</A></DIV>
<DIV> </DIV>
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