Magneto Service Instructions - Wisconsin Air Cooled TRA-10D Instruction Book And Parts List

Since breaker arm operates at half engine speed,
it is necessary to line up flywheel timing mark
with pointer, while engine is on compression
stroke. The compression stroke can be determined
by turning starter sheave in a clockwise direction
and watch for breaker arm movement by push pin
in beaker box.
3. Connect one lead wire of the timing light DF-81-S1
to ground and the other to terminal stud at bot-
tom of breaker box. (With points closed, the timing
light will be on).
4. Slightly loosen lockscrew on contact support plate
(just enough so that plate can be moved).
5. Insert a screw driver into support plate adjusting
slot and close points so that light is on, then turn
screw driver slowly in the opposite direction until
the light just goes out. Retain points in this posi-
tion and securely tighten lockscrew.
6. As a final check; turn flywheel counter-clockwise
until timing light is on. Then, slowly rotate fly-
wheel clockwise, and stop immediately when light
goes out. At this point, mark on flywheel should
line up with pointer in shroud.
7. Assemble coil primary wire to terminal stud and
mount cover.
MI-1063
Fig. 12

MAGNETO SERVICE INSTRUCTIONS

If engine will not start or if it is hard to start and
does not run properly, make the following tests to
see if the magneto is at fault:
1. Check carefully for loose, corroded, broken or worn
ignition wires.
2. Check the spark; refer to "Ignition Spark" and
"Spark Plug" paragraphs.
3. Check points for cleaning and adjustment. If badly
worn or corroded points and condenser should be
replaced. Refer to "Breaker Point Adjustment"
paragraphs.
4. Magneto coil replacement should be done by a com-
petent mechanic using adequate test equipment.
The coil can be tested in the following manner and
without removing the flywheel:
Position the flywheel so the keyway is at the
bottom.
Remove the coil primary lead from the terminal con-
nection at the breaker box and the spark plug lead
from the plug. The coil can now be tested using the
primary lead, the high tension lead, and the engine
block as the ground connection.
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