Spark Plugs; Ignition Timing Check; Engine - Honda CB400T Shop Manual

HONDA
INSPECTION AND ADJUSTMENT
CB4OOT
(ENGINE)
SPARK PLUGS
Disconnect the spark plug caps and remove
the spark plugs.
Visually inspect the spark plug electrodes for
wear. The center electrode should have square
edges and the side electrodes should have a
constant thickness. Discard the spark plug if
there i s apparent wear or if the insulator is
Check : gap
cracked or chipped. If the spark plug deposits
0.6-0.7 m m
: deposit
can be removed by sandblasting, the spark (0.024-0.028 in.)
: dirt
plug can be reused.
: wear
Adjust the spark plug gap by bending the side
electrode.
SPARK PLUG GAP: 0.6-0.7
mm
10.024-0.028 in.)
RECOMMENDED SPARK PLUG:
NGK D8EA
N D X24ES-U
Reinstall the spark plugs and reconnect the
spark plug caps.
NOTE
First tighten the spark plug finger tight.
then tighten with a spark plug wrench.
IGNITION TIMING CHECK
NOTE
The C.D.I. (Capacitive Discharge Igni-
tion) ignition timing
i s
not adjustable.
I f the ignition timing is incorrect, check
the C.D.I. unit and A.C. generator and
replace any defective parts. See Section
l f i
Remove the left crankcase cover.
Check the ignition timing using a strobe light
(07308-0070000).
Timing is correct if the index mark aligns w i t h
the "F" mark at idle.
Also check that the index mark is between
the advance marks at 5.350 rpm.
Check
:
sealing
: damage
Check : damage
: crack
3- 2
Date of Issue: September. 1977
O HONDA MOTOR CO.. LTD.