Honda CB160 Shop Manual page 120

116 6. INSPECTION AND MAINTENANCE
Fig. 6. 9
Checking clearance with a thickness gauge
fig. 6. 10 Tools required for adjusting the spark liming
Fig. 6. 12 Adjustment of liming
(CAUTION)
Adjust the tappets when the engine is cold, A
thickness gauge of 0.03 mm (.001_2 mm
6
)
should
pass, while that. of
0.05
mm (.00195") cannot.
When the adjusting nut is tightened, the clearance
will change slightly. Hald the adjusting screw with
the special clearance adjusting tool, while tightening
the nut.
3. Ignition Timing
Even though compression and valve timing are satis·
factory, if the spark timing is not correct the engine
will not operate smoothly. If the timing is too bod,
overheating or backfire may result, bath of which are
detrimental ta the condition of the engine.
Tools required far adjusting the spark timing. (Refer
to Fig. 6. 10)
a. Remove the distributor point caver.
b. Remove the generator caver and check
clearance.
c. Check the paints far pitting, burning or protru-
sions. If necessary, remove and correct by
honing with an ailstane.
d. Rotate the crankshaft and align the highest port
of the point cam with the breaker arm sleeve.
(NOTE)
There are two cams an the distributor point shaft.
Either com may be used.
e. Ta adjust paint det:lrance, loosen the twc
breaker arm retaining screws and adjust (bl with
a screwdriver. When (bl is turned ta the dght
the clearance decreases. (Refer to Fig. 6. 12)
f. Standard clearance is from
0.05
(.00195
6
)
mm
ta 0.35 (.0136) mm.
g. When the mark an the generator is aligned
with the mark an the stator, the contact points
should open. This is the correct timing adjust·
ment.