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Troubleshooting the Rotax line of two stroke ultralight aircraft engines.
Troubleshooting the Rotax line of two stroke ultralight aircraft engines.
UltralightNews.com
The only solution for the coil failures is to replace the coil, it is also a good idea to have
an extra one on hand.
If ordering an EXTRA coil for the CDI engines order the PTO side coil, the leads will fit
on both sides.
When replacing the coil on the points equipped engines make sure the ground wire is going to the right side of the coil. On Rotax
air cooled engines with points ignition the coils are wired opposite to each other. That is on one coil the ground goes to #1
and on the other it goes to #15!
The problem with the wear on the point arms generally occurs in the first 10 to 15 hours
of operation and if the owners manual recommendation for all engines is followed, the
owner will have had his timing checked during this period of time.
Rotax Owners Manual / Rotax Parts Manual
On the subject of the owners manual, this is a very complete and concise document, and
if read and followed, will eliminate most of the problems associated with some of the
most widely reported engine problems.
Troubleshooting the Rotax line of two stroke ultralight
aircraft engines.
(Cylinder head temperatures should range in the 300 to 400 degree F range.)
In practice, a properly tuned engine should show a nice chocolate, or brown color on the spark plug, white indicates an engine
running hot, while black indicates one running to rich. Any sign of aluminium on the spark plug indicates a problem of a very serious
nature, and requires your immediate attention!
Rotax Aircraft Engine Ignition System Problems:
The most widely reported problem with the Rotax ignition system is in the
failure of the ignition coils, and pickups on the Dual CDI engines.
Coil failure and the wearing of the point arms, causing improper timing on
the points equipped engines. Apply grease to underside of point arm to help
prevent wear.
