Honda CB300FA Owner's Manual page 60

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56
Spark Plug .... Checking Spark Plug
8. Inspect the electrodes and center
porcelain for deposits, erosion or carbon
fouling.
.... If the erosion or deposit is heavy,
replace the plug.
9. Make sure that a 1.0 mm wire-type
feeler gauge cannot be inserted between
the spark plug gap. If the gauge fits in
the gap, replace the plug with a new
one.
10. Make sure the plug w asher is in good
condition .
+---Spark plug gap
11. With the plug washer attached, thread
the spark plug in by hand to prevent
cross-th reading .
12. Tighten the spark plug:
• 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:
NGK: 1/2 turn after it seats.
b)Then loosen the plug.
c) Next, tighten the plug again:
1
/8 turn after it seats.
mum
Improperly tightened spark plugs 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.
13.
Reinstall the spark plug cap. Take care
avoid pinching any cables or wires.
14. Install the parts in the reverse order of
removal.