Spark Plug Cleaning And Adjustment - Yamaha AR240 HO Owner's Manual

SpARK pLUG CLEANiNG ANd
AdJUSTmENT
WARNING
Be careful not to damage the insu-
lator when removing or installing
a spark plug. A damaged insulator
could allow sparks to escape, which
could result in a fire or explosion.
The spark plug is an important engine
component and is easy to inspect. The
condition of the spark plug can indi-
cate something about the condition of
the engine. For example, if one spark
plug has a distinctly different color,
the engine could require servicing. Do
not attempt to diagnose any problems
yourself.
Have a Yamaha dealer service the boat.
Remove and inspect the spark plugs
periodically; heat and deposits will
cause the spark plugs to slowly break
down and erode. If electrode erosion
becomes excessive, or if carbon and
other deposits are excessive, replace
the spark plug with the specified plug.
Standard spark plug:
LFR6A
To Remove a Spark plug:
1) Remove the engine cover screws
and engine cover.
2) Remove the spark plug cap screws
and spark plug cap.
NOTiCE:
do not use any tools to remove or
install the spark plug cap, otherwise
the ignition coil coupler could be
damaged. The spark plug cap may
m
aIntenance
be difficult to remove because the
rubber seal on the end of the cap
fits tightly. To remove the spark plug
cap, simply twist it back and forth
while pulling it up; to install it, twist
it back and forth while pushing it
down.
3) Remove the spark plug. Measure
the spark plug gap with a wire thick-
ness gauge. Replace the spark
plug or adjust the gap to specifica-
tion if necessary.
Spark plug gap:
0.8 ~ 0.9mm (0.031 ~ 0.025 in)
To install a Spark plug:
1) Clean the gasket surface.
2) Wipe any dirt from the threads of
the spark plug.
3) Install the spark plug, and then
tighten it to the specified torque.
Spark plug tightening torque
25 Nm (18.4 ft-lb) (2.5 kgf-m)
4-7
4
& c
are