22
bit higher than idle speed. Then turning idle
adjusting screw until the engine speed is lower
than idle speed and turn back for 1/4 turns.
C
．
The fuel level in the float chamber must be
within the
Ф
3 circle in the centre of fuel
mirror. When the f fuel level is too high or too
low, it can be be regulated by changing the
thickness of the spaces of float needle valve
seat.
D. The position of choke valve spring in order to
facilitate starting when ambient temperature is
below—15
℃
, the mixture must be richer .For this purpose. The hook up position of the
choke valve spring on the rocker must be changed from step1to step2 (fig.4-4).
4.2.4 IGNITION SYSTEM MAINTENANCE
4.2.4.1
The ignition timing has been adjusted prp-delivery and is happens during operation due to change
of ignition timing and readjustment is necessary, carry out adjustments as follows:
A
．
Turn crankshaft to set the piston of No.1 cylinder at TDC position of compression stroke.
B. Open distributor cover and observe the position of rotor head make the end with notch of
contact set face forward (fig.4-5)
C
．
Turn crankshaft again and check the cross firing moment across breaker contact points. When
cross firing happens, the angle on the timing chain cover facing the boss mark of crankshaft is
ignition timing.
D
．
If ignition timing is not within 6±2
℃
loosen the locknuts for distributor housing and adjust it
by swinging the housing .swinging anticlockwise increases ignition advance angle, while
swinging clockwise reduces it(fig.4-6)
4.2.4.2
The type of spark plug is F6T. The surfaces of insulator and electrode must be clean and free
from carbon deposit. The electrode gap is 0.7±0.1mm. Within the end face of enter electrode, the
gap valve must be more or less the same. It is possible to adjust the electrode gap by moving
ground electrode.
When installing and removing spark plug, care must be taken to prevent the screw hole in
cylinder head from damage. Replace spark plug if it is faulty.
