Honda CBR 2018 Series Owner's Manual page 65

Inspect the electrodes and center
8.
porcelain for deposits, erosion or carbon
fouling.
If the erosion or deposit is heavy,
u
replace the plug.
Make sure that a 1.0 mm wire-type feeler
9.
gauge cannot be inserted between the
spark plug gap. If the gauge fits in the
gap, replace the plug with a new one.
Make sure the plug washer is in good
10.
condition.
Spark plug gap
Spark Plug
Install the spark plug. With the plug
11.
washer attached, thread the spark plug in
by hand to prevent cross-threading.
Tighten the spark plug:
12.
If the old plug is good:
●
1/8 turn after it seats.
If installing a new plug, tighten it twice
●
to prevent loosening:
a) First, tighten the plug:
1/2 turn after it seats.
b) Then loosen the plug.
c) Next, tighten the plug again:
1/8 turn after it seats.
NOTICE
An improperly tightened spark plug can damage the
engine. If a plug is too loose, a piston may be damaged. If
a plug is too tight, the threads may be damaged.
Install the parts in the reverse order of
13.
removal.
When reinstalling the spark plug cap,
u
take care to avoid pinching any cables
or wires.
Checking Spark Plug
u
61