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RotaxEngines-List Digest: 1 Msgs - 07/30/18

 
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Dick Maddux



Joined: 24 Jun 2008
Posts: 515
Location: Milton, Fl

PostPosted: Tue Jul 31, 2018 6:08 am    Post subject: RotaxEngines-List Digest: 1 Msgs - 07/30/18 Reply with quote

Dave,
 I was going to guess an internal broken wire before I got to end of your post as this has happened to me twice and is a common issue in these engines.
Dick Maddux 
 
In a message dated 7/31/2018 1:41:24 AM Central Standard Time, rotaxengines-list(at)matronics.com writes:

 
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=========================
Online Versions of Today's List Digest Archive
=========================

Today's complete RotaxEngines-List Digest can also be found in either of the
two Web Links listed below. The .html file includes the Digest formatted
in HTML for viewing with a web browser and features Hyperlinked Indexes
and Message Navigation. The .txt file includes the plain ASCII version
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================================================
EMail Version of Today's List Digest Archive
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RotaxEngines-List Digest Archive
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Total Messages Posted Mon 07/30/18: 1
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Today's Message Index:
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1. 07:51 PM - 912 ULS sudden rough running on mag check (Dave)

________________________________ Message 1 _____________________________________
Time: 07:51:06 PM PST US
From: Dave <daberti(at)sbcglobal.net>
Subject: 912 ULS sudden rough running on mag check
My engine ran fine on a local flight to a neighboring airport last week. When
leaving, I had some vibration, rough running that is not characteristic to my
engine. I powered up the boost pump and it seemed a little better so I continued
to taxi. Just prior to the run up area I got a few more shakes so I pulled
off to check under the cowling. I found nothing amiss so I continued to checklist
and mag check. My A side ran fine but B dropped 150 or so then ran fine.
I flew the 30 min flight home without incident and arriving at the hanger
did my usual shutdown mag check. The B side shook like crazy and I could not
power through the rough running. Heres what I found.
Grounds all normal. Checking the trigger coils resistance all was normal. I took
the connectors apart and established continuity to the triggers. Checked the
coil primary side and one had no resistance, meaning two cylinders got no spark.
I used a pin and checked the white wire near the coil and got good readings


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