Troubles; Trouble; Magneto; Troubleshooting - Robin EC03ER Service Manual

6. MAGNETO
6- 1
MAGNETO TROUBLESHOOTING
When engine does not start or starts with difficulty, or when its operation is unstable, the following
.tests will clarify if they are caused by a defect in magneto.
(1) Check ignition cable for possible corrosion, broken, worn insulation or loose connection.
(2)
Check sparks as described in the following
-
section.
(3)
If
no spark flys, replace ignition coil.
. .
6-2 SPARK
TESTING
Remove spark plug from cylinder head and place it on cylinder, with the ignition cable
connected to it.
Crank the engine several times by recoil starter and observe sparks at the spark gap of spark
plug. If spark is strong, the ignition system .can be eliminated as the source of trouble.
If the spark is weak or there is no spark. at all, repeat the checks. according to the trouble-
shooting chart "Ignition system problems caused by" (Refer to section
" 8 TROUBLE
-
SHOOTING").
BREAK- IN OPERATION OF REASSEMBLED ENGINE
overhauled engine must be operated carefully to break-in the parts.
a h
,
A
thorough break-in is indispensable particularly when the cylinder, piston or piston ring are
replaced with new ones.
.For break-in of' overhauled engines; use mixture fuel of gasoline
20
:
1 part
oil for the first
ten (1 0 )
hours of operation.
8. TROUBLESHOOTING
8- 1 TROUBLESHOOTING
The following three conditions must be fulfilled for satisfactory engine starting.
1. The cylinder filled with a proper fuel- air mixture.
2. Good compression in the cylinder.
3. Good spark, properly timed, to ignite the mixture.
The engine cannot be started unless these three coditions are met. There are also other factors
which make engine start difficult, such as a heavy load initially applied t o the engine, and
a high back pressure due to a long exhaust pipe.
The most common causes of engine troubles are given in the tables in the following pages.
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