Spark Plug - Honda XRE300 Owner's Manual

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Spark Plug

(Refer to the Safety Precautions on page 53.)
Recommended plugs:
Standard:
DPR8EA–9S (NGK)
For extended high speed riding:
DPR9EA–9S (NGK)
For most riding conditions this spark plug heat range
number is satisfactory. However, if the motorcycle is
going to be operated for extended periods at high
speeds or near maximum power in hot climates, the
spark plug should be changed to a colder heat range
(a higher number).
NOTICE
Never use a spark plug with an improper heat range.
Severe engine damage could result.
1. Disconnect the spark plug cap (1) from the spark
plug.
2. Clean any dirt from around the spark plug bases.
Remove the spark plug using the spark plug
wrench furnished in the tool kit.
3. Discard the spark plug.
4. With the plug washer attached, thread the spark
plug in by hand to prevent cross-threading.
(1)
5. 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: 1/4 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.
6. Reinstall the spark plug cap. Take care to avoid
pinching any cables or wires.
XRE300 · XRE300A
Spark plug cap
(1)