Toro Lawn-boy - Ignition System; Troubleshooting; Testing; Spark Plug Operation

31
IGNITION SYSTEM
Testing
Check the i
g
nition system in the followin
g
order:
1. Spark plu
g
(connection & wire, condition).
2. CD Pack (air
g
ap, connections or spark).
3. Flywheel (key and ma
g
nets).
Use the table above to aid in dia
g
nosin
g
the problem.
Spark Plug Operation
The spark plu
g
i
g
nites the oil-fuel mixture by producin
g
a spark just before the piston reaches top dead center
(TDC). A spark plu
g
is typically constructed as shown.
(See Fi
g
ure 46.)
Fi
g
ure 46
3297-014
Troubleshooting
Problem Possible Cause Su
gg
ested Remedy
Misfirin
g
, no firin
g
, en
g
ine sur
g
es,
en
g
ine dies (Note: these
symptoms may also be caused by
fuel system problems)
Spark plu
g
or lead wire loose Ti
g
hten plu
g
Spark plu
g
in poor condition Replace plu
g
CD Pack air
g
ap wron
g
Adjust
CD Pack hi
g
h tension lead loose Secure with GE silicon sealant
CD Pack leads loose, dirty, or
g
roundin
g
Clean and ti
g
hten leads/replace
CD Pack defective Replace CD Pack
Flywheel key dama
g
ed or sheared Replace key and check keyway
(see Servicin
g
the Flywheel in this
section)
Flywheel ma
g
nets dema
g
netized
or weak
Replace flywheel
En
g
ine will not stop Broken
g
round wire Check the
g
round wire between the
ma
g
and kill switch. Look for
breaks or loose connections.
A. Metal Shell
B. Center Electrode
C. Ground Electrode
D. Head Insulator
E. Copper core
F. Le
g
Insulator
G. Gap