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<DIV>Looks like you have done everything. However, I will be suspicious that something in the fuel is messing up the plugs. Base on your description the engine runs OK for the day using the Morgan 20% fuel. I wonder if you could try another fuel for the whole flying section and check next day. It could be a bad batch of fuel. Just an idea. </DIV>
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<DIV>Question: Are you both using same fuel?</DIV>
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<DIV>Good luck at the Nats.</DIV>
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<DIV>Vicente Bortone</DIV>
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<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">-------------- Original message -------------- <BR>From: Ron Van Putte <vanputte@cox.net> <BR><BR>> John Fuqua has been having an annoying and thoroughly confusing <BR>> problem. He has been using two different OS 1.40 RX engines for the <BR>> past three years and they've run flawlessly until recently. He's had <BR>> one in an Impact since the early spring. A month or so ago, the <BR>> engine started dying in the air periodically when he advanced the <BR>> throttle from idle. He tried adjusting the idle mixture control and <BR>> the main needle valve and the problem seems to go away. <BR>> <BR>> Suddenly, a few days ago, the engine would die as soon as the ignitor <BR>> was removed. No problem: it's the plug(s). He's using the Mintor <BR>> 1.40 head on these engines and they have two plugs. Replace both <BR>> plugs. Engine ran flawlessly for the rest of
the flying session. <BR>> The next day, the problem was back, exactly like it was the day <BR>> before. Then we removed the entire fuel system, cleaning everything <BR>> and replacing the fuel tubing, fuel filter and tank clunk. Replaced <BR>> the glow plugs as well. Engine ran flawlessly for the rest of the <BR>> flying session. The next day, the problem was back, exactly like it <BR>> was the day before. Yanked out that engine and installed its twin, <BR>> fresh after a rebuild. Engine ran flawlessly for the rest of the <BR>> flying session. The next day, the problem was back, exactly like it <BR>> was the day before. John has been using Morgan 20% heli fuel as long <BR>> as he's been running these engines and it's worked great. <BR>> Nevertheless, during this ongoing saga, we tried Morgan 30% heli fuel <BR>> and Morgan Pro Power 20% and nothing seems to break the pattern. <BR>> HELP! We leave for the Nats tomorrow. <BR>> <BR>> BTW, I
have been using an OS 1.40 RX in my airplane for the past two <BR>> seasons and have loved it. <BR>> <BR>> Ron Van Putte <BR>> <BR>> _______________________________________________ <BR>> NSRCA-discussion mailing list <BR>> NSRCA-discussion@lists.nsrca.org <BR>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion </BLOCKQUOTE></body></html>