[5] Tightening torque specifications
R
epair
P
19
/
19
[4] DISASSEMBLY/ASSEMBLY
[4]-9. Ignition system (cont.)
CHECKING SPARK PLUG
(1) Remove Plug cap from Spark plug, then Spark plug from Cylinder head complete with the supplied socket wrench.
Note:
If the electrodes of Spark plug are wet, wipe them with a rag then dry them with an air blower.
(2) Using a wire brush, carefully clean up carbon deposits (if any) from the electrodes and the ceramic insulator around
the center electrode.
(3) Adjust the electrode gap to 0.5mm by carefully bending the side electrode.
Use Feeler gauge set (1R366) to check the gap width:
between the center electrode and the side electrode, insert 0.5mm leaf
of Feeler gauge set. (
Fig. 42
)
(4) Install another Spark plug into spark plug hole to prevent air/fuel mixture
from leaking outside of engine.
(5) Connect the removed Spark plug with Plug cap, then ground the threads
of Spark plug to a proper metal part of the engine.
(6) With Stop switch on, pull Recoil starter knob gently and check for spark.
Note:
It is hard to see the spark in a bright location.
Therefore, be sure to do the check in a shady but well-ventilated place.
(7) If spark is not produced, replace Spark plug with a new one,
then check for spark by following the procedure (1) to (6) once again.
WARNING !!
•
When a spark is produced, high-voltage current is delivered from Ignition coil to Spark plug.
It is, therefore, very dangerous to pull Recoil starter knob with your hand on Ignition cable.
Be sure to keep your hands off from Ignition cable when checking for spark.
•
Fuel is extremely flammable and fuel vapors are explosive.
Therefore, clean up spilled fuel before starting to check for spark.
Also, be careful not to do the check near Carburetor.
Fig. 42
Electrode gap
must be 0.5mm.
side electrode
center electrode
Cushion
Tank complete
M6x30 Hexalobular socket head bolt
7
Cutting arm
Cylinder block complete
M6x25 Hexalobular socket head bolt
30
Cutting arm
Belt cover
M8 Hex nut
3
Front inner holder
M6x30 Hexalobular socket head bolt
12
Crank case
Cylinder block
M6x30 Hexalobular socket head bolt
12
Cylinder head complete
Cylinder block
M6x35 Hexalobular socket head bolt
40
Flywheel
Crankshaft
M10 Flange nut
38
Clutch holder
Crankshaft
M10-17 Hex lock nut
Clutch assembly
Crankshaft
Hexagonal portion (M16-24) of Clutch holder
18
Rocker arm
M5x9 Hex nut
M5 Hex socket head bolt
1
2
3
4
5
6
7
9
8
10
6
Application
(for fastening A to B)
A
B
Fastener
Tightening
torque (N.m)
