I'll second that. . . . check your bearings and put in a set of stainless. . .<br><br>
<div><span class="gmail_quote">On 6/26/06, <b class="gmail_sendername"><a href="mailto:mwaustin54@cox.net">mwaustin54@cox.net</a></b> <<a href="mailto:mwaustin54@cox.net">mwaustin54@cox.net</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">You might check your bearings. My OS 140 did this after 50 or so flights. New bearings solved the problem. I also run the Mentor head and like the transition.
<br><br>Mike A.<br>---- Ed Miller <<a href="mailto:edbon85@charter.net">edbon85@charter.net</a>> wrote:<br>> Have an OS 140RX that has developed a rough and inconsistent idle. Engine<br>> runs perfectly except for idle. It has a Mintor head with either an OS F or
<br>> K&B 1L in center plug and an OS A5 in the angled plug position, a Perf Spec<br>> AAC piston/liner assembly and a Boca sealed SS rear bearing. I have the head<br>> mounted with angled plug towards the front or carb side of engine. Fuel is
<br>> S&W 20 nitro, 16 synthetic and 2 castor. Engine has 7 gallons of fuel run<br>> through it. Prop is an APC 15.75 x 11 3 blade by Dave Lockhart. The lowest<br>> I can get the idle before it quits is 1900 ~ 2000 rpm and it is rough,
<br>> sounds like it is firing every other revolution. Idle mixture screw is<br>> working, I can richen idle to point where engine will barely transition from<br>> being rich and I can lean mixture so the transition is fine but engine slows
<br>> at idle like it is too rich. While it is slowing with either the idle<br>> mixture screw lean or rich, engine is rough, again like it often fires every<br>> other revolution at times. I used to be able to reliably idle this engine at
<br>> 1300 rpm. I have a second OS 140RX set up exactly the same except it doesn't<br>> have the AAC piston/liner and it runs/idles perfectly. Tried cleaning the<br>> carb/spray bar with no change. I once had a Super Tiger that exhibited
<br>> similar characteristics due to a worn out con rod. Is it possible the con<br>> rod on this OS could cause this issue ?? Any suggestions will be greatly<br>> appreciated.<br>> Ed M.<br>> _______________________________________________
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http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br></blockquote></div><br><br clear="all"><br>-- <br><br>Keith Hoard<br>Collierville, TN<br><a href="mailto:khoard@gmail.com">khoard@gmail.com</a><br><br>