Checking The Spark Plugs - Yamaha VMAX 2009 Service Manual

Throttle cable free play
3.0–5.0 mm (0.12–0.20 in)
2. Adjust:
• Throttle cable free play
M MMM M MMM M M MMM M
a. Slide back the rubber cover "1".
b. Loosen the locknut "2".
c. Turn the adjusting nut "3" in direction "a" or "b"
until the specified throttle cable free play is
obtained.
Direction "a"
Throttle cable free play is increased.
Direction "b"
Throttle cable free play is decreased.
d. Tighten the locknut.
e. Slide the rubber cover to its original position.
1
L LLL L LLL L L LLL L
EAS20680

CHECKING THE SPARK PLUGS

The following procedure applies to all of the
spark plugs.
1. Remove:
• Battery box
Refer to "GENERAL CHASSIS" on page 4-1.
2. Disconnect:
• Spark plug cap
3. Remove:
• Spark plug
a
M MMM M M MMM M M MMM M
a
b
2 3
L LLL L L LLL L L LLL L
ECA13320
NOTICE
Before removing the spark plugs, blow away
any dirt accumulated in the spark plug wells
with compressed air to prevent it from falling
into the cylinders.
4. Check:
• Spark plug type
Incorrect → Change.
5. Check:
MMM
• Electrode "1"
Damage/wear → Replace the spark plug.
• Insulator "2"
Abnormal color → Replace the spark plug.
Normal color is medium-to-light tan.
6. Clean:
• Spark plug
(with a spark plug cleaner)
ECA2S31057
NOTICE
Do not use a wire brush to clean the spark
plugs, as it will damage the iridium coating
on the electrode.
7. Measure:
• Spark plug gap "a"
(with a wire thickness gauge)
Out of specification → Replace.
LLL
8. Install:
• Spark plug
3-10
Manufacturer/model
NGK/CR9EIA
Manufacturer/model
DENSO/IU27D
Spark plug gap
0.8–0.9 mm (0.031–0.035 in)
1
2
Spark plug
13 Nm (1.3 m·kgf, 9.4 ft·lbf)
ENGINE
a