Kees
Had the same experience. Good ohm check of the coil, but after buying
two coils and swapping them around, finally found the bad one. Tell
tale sign was the steel plates that make up the core had corroded and
began to split a bit at the edge. Autopsy revealed the inside was
worse. I guess the distance of the split of only a fraction of a mm
reduced the coils effectiveness. Found a second coil with corrosion and
changed it out also.
We also used a timing light on each plug wire looking for weak spark or
a miss, and that was somewhat effective finding it also. Very
frustrating to do though, as the proximity of the pickup to the plug and
direction of the pickup must be the same on each cylinder to get results
that are conclusive.
Bottom line is it is a bit of trial and error. Not for the impatient or
those of limited means. It takes a bit of time.
Regards,
Bud Yerly
Tech Support
----- Original Message -----
From: kees de bussy<mailto:keesdebussy@hotmail.com>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Friday, September 21, 2012 6:44 AM
Subject: Europa-List: Re: 914 - rough running, and RPM drop when
testing the A circuit
<keesdebussy@hotmail.com<mailto:keesdebussy@hotmail.com>>
For what it is worth. I experienced 2 times a similar problem with my
Rotax 912s. About 4 years ago for the first time and it was figured out
that 1 of the wires of 1 of the ignition boxes was broken close to the
connector. The wire was soldered which solved the problem.
A few weeks ago it happened again. So I checked the wires but with no
result. Furthermore I checked the spark plug leads, spark plug
connectors, pull off force, etc. replaced all the spark plugs but no
results.
Eventually the problem was located by a local Rotax dealer who
discovered a faulty ignition coil. The error in the ignition coil could
not be detected by measurement but only by swapping parts. Hence it was
a real pain to find out.
Good luck.
Kees de Bussy
PH-SBR
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