Inspecting Sparkling Performance; Testing Spark Plug Firing; Testing Ignition Coil; Measuring Resistance - Honda C50 Shop Manual

3.
5.5 BATTERY
G SPARKING PERFORMANCE
: - ··: CSO C65, S50, S65 the flywheel A.C
~:-
;·::·:: • c1d an externally mounted ignition coil is
..::e::. -'-" .C ignition system is employed and, there-
'::·e
.-."en pe rforming the ignition coil test, th e specified
=-
.~,~vnee l
A. C generator must be used. However, a
simpl e method of determing the serviceablity is made
by th e fo llowing three methods.
I 11 The most simple method is to remove the spark
plug and perform the starting procedure with the
spark plug grounded to the engine. When a
strong spark of bluish w hite color is produced,
it is an indication of satisfactory ignition coi l and
,flywheel A.C generator. (Fig. 5-1 0)
If no spark is produced, it is an indication of
defective primary coil of either the ignition coil
or flywheel A.C generator.
121 Another method is t o measure the resistance o f
the ignition coil and the flywheel A.C generator
primary coil.
(Fig. 5- 11)
Ignition coil resistance 126700-111-29700- 113-21
1. Primary coil : Resistance b etween primary
black leads and case should
be appro ximately 4.5..Q.
2. Secondary coil: Resistance between high ten-
sion lead and ground shou ld
be approximately 9.5..Q..
When th e resistance measurement across the
flywheel A.C generator primary coil is approximately
1.3..Q. lower than the above val ue, the cause may
be a short or grounding; an inflnate resistance would
indicate an open dircuit.
(Caution)
Resistant measurement of the primary coil must
be made w ith the breaker points opened and
the condenser lead wire disconnected as a
leaky condenser will give an improper indication.
Spark plug
Figure 5-10. Testing spark plug fir ing
Figure 5-11. Testing ignition coil
generator
Figure 5- 12. Measuring resistance
77