Table of Contents
Advertisement
L
Spark plug
The spark plug
is
an
important
engine com-
ponent and is easy to inspect. The condition
of the
sp~rk
plug can indicate something of
the
condition of the engine.
For example, a very white center electrode
porcelain color could indicate an intake air
leak
or carburetion problem for that cylinder.
Do not attempt to diagnose such problems
yourself.
Instead, take the machine to a Yamaha
dealer.
You should periodically remove and inspect
the spark plug because heat and deposits will
cause any spark plug to slowly break down
and erode. If electrode erosion becomes ex-
cessive, or if
·
carbon and other deposits are
excessive, you should replace the spark plug
with one of the proper type.
Standard spark plug:
D7EA (NGK) or X22ES-U
(N IPPONDENSO)
Before installing any spark
plug,
measure the
electrode gap with a wire thickness gauge
and adjust to specifications.
Spark plug gap:
0.6
-
0.7 mm (0 .024
-
0.028 in)
1.
Spark plug gap
When
installing
the
plug, always clean the
gasket
seat surface and use a new gasket.
Wipe
off any grime from the threads and tor-
que
the spark plug properly.
-66-
Advertisement
Table of Contents
