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Maintenance and care
77
If the reverse gate does not make contact with
the stopper, have a Yamaha dealer service it.
EJU34360
Checking and adjusting the throttle
cable
Check that the throttle cable moves back to
the set position smoothly and that the throttle
lever free play is within specification.
(1) Squeeze and release the throttle lever. If
the throttle lever does not return smooth-
ly, have a Yamaha dealer service it.
(2) Adjust the free play by loosening the lock-
nut and turning the adjuster.
EJU34391
Cleaning and adjusting the spark
plugs
The spark plug is an important engine compo-
nent and is easy to inspect. The condition of
the spark plug can indicate 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 at-
tempt to diagnose any problems yourself.
Have a Yamaha dealer service the watercraft.
Remove and inspect the spark plugs periodi-
cally; heat and deposits will cause the spark
plugs to slowly break down and erode. If elec-
trode erosion becomes excessive, or if carbon
and other deposits are excessive, replace the
spark plug with the specified plug.
To remove a spark plug:
(1) Remove the seat. (See page 28 for seat
removal and installation procedures.)
(2) Remove the spark plug cap.
CAUTION:
ECJ00210
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 be difficult to remove be-
cause 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
thickness gauge. Replace the spark plug
or adjust the gap to specification if neces-
sary.
1 Locknut
2 Adjuster
3 Throttle lever free play
Throttle lever free play:
4.0–7.0 mm (0.16–0.28 in)
Specified spark plug:
CR9EB
1 Spark plug gap
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
UF1K12E0.book Page 77 Friday, July 28, 2006 10:35 AM