Honda ST50 Shop Manual page 50

48
S I hon
Sparkl.DJ
pcrform•-
(uacmbled coil)
OVCT 6mm w1tn n - - spar.I( pp, at
JUUUrpm
Over 8mm wuh J needle sparkpo,
at
8000mm~ll OOOrnm
With UW+)w+I. W oad connected
over S.2V at 2.SOOrpm
below 9 OV at 8000rpm
5-1 A. C. generator inspection
When the resistance measuremen t across the fly-
wheel A.C. generator primary coil is appro11i-
matcly 1.Jn the cause mat
be
a short or
ground-
ing. An infinite resistance indicates an open
circuit.
Caution :
Resis1aocc measure ment
or
the primary coil
must be m.ad c l'l'lth the bceaker points opened
and lhe condenser lead ,i-ire disconn«ted. A
leaking condenser will g[,·c an improper indica-
tion.
5-2 Ignition coil
The flywheel A.C. generator and an externally
mounted ignition coil is equipped. A simple method
of dcterming serviceability of the ignition coil
is by the following method;
(I) The simplest method is to remove the spark
plug and perform the starting procedure
with the spark plug grounded to the engine.
When a strong spark or bluish white color
isproduccd.itisanindiclllionofasa1isfac1ory
igni ti on coil and flywheel A.C. gcneraior
(Fig. 105)
If
no spark or a weak spark is prodiccd,
it is an indication of defective primary coil
of ei1her the ignit ion coil or flywheel A.C.
generator. Another reason may be that a
spark is not produced across the electrodes
because of a shortage or a broken wire in
!he primary coil
Flg.104
Fig.105