Magneto; Breaker Point Adjustment - Robin EC05-2 Service Manual

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7 . MAGNETO
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7-1
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MAGNETO
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The spark for ignition is furnished by a magneto assembly. The magneto consists of a flywheel, ignition coil and breaker
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assembly .(.including condenser),
o f
which flywheel is 'mounted on. crankshaft and ignition coil and breaker assembly are
mounted
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in crankcase directly.
7-2 BREAKER POINT ADJUSTMENT (Fig. 7-2)
The breaker points, which are mounted in the crankcase in-
side the flywheel should be checked twice a season or when-
ever the ignition, spark becomes weak. If there is,evidence
of pitting or pyramidding, the breaker points must be cor-
rected, and then it becomes necessary to readjust the gap t o
its proper clearance. (0.4 mm
for Model EC10)
The normal breaker point opening is
0.4
mm at full separa-
tion. Since the spark timing
of
18"
is
regulated by the point
opening, use a timihg light to obtain an accurate spark ad-
vance. (Refer t o "7-3 TIMING ADJUSTMENT.")
NOTEI The point gap of other engines.than model EC70 is
as follows:
EC05
:
0.35 mm
EC07-2
:
0.35mm'
ECl7 : 0.30 mm
EC25-2 : 0.35mm
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Ftg. 7-2
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To adjust breaker poixit opening, remove starting pulley, blower houshg and flywheel from the eingine and proceed as follows:
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(See
Fig. 7-2.)
1) Remove breaker cover from contact breaker.
2) Turn
crankshaft .over until. breaker arm comes in contact with. the high point
of
the breaker cam. (maximum point
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opening of
0.4
mm)
3) Loosen contact suppoit plate lock screw just enough so that bracket can be moved.
4) Insert a 0.4 mm feeler gauge between the points.
CAUTION: ADJUS? BREAKER POINT
GAP WITHOUT OPENING IT MORE THAN 2 mm, OTHERWISE RATED
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HEEL-PRESSING FORCE MAY NOT BE: OBTAINED 'DUE TO THE BENDING Of CONTACT BREAKER ARM.
5 ) Apply a screw driver to.adjusting tab and move the contact support plate just enough so that a slight drag is felt while
sliding the feeler gauge from between the points.
6 ) k g h t e n lock screw and recheck breaker point gap.
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7)
Pull a strip of 8
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10 mm wide white paper through the closed points to remove o i l and dust on the point surfaces.
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CAUTION: WHEN INSERTING A SHEET OF PAPER;, NEVER OPEN THE BREAKER POINT GAP MORE THAN:2mm.'
8) Mount flywheel, blower housing and starting pulley on engine after adjustment.
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