Yamaha YZF-R15, Service Manual

Page: 75 / 338

3-6 3-7
ENGINE ENGINE
10.Change the CO adjustment volume by press-
ing the “UP” and “DOWN” buttons.
NOTE:
The CO adjustment volume and engine idling
speed appears on the LCD of the FI diagnostic
tool.
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To decrease the CO adjustment volume, press
the “DOWN” button.
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To increase the CO adjustment volume, press
the “UP” button.
11.Release the “DOWN” and “UP” buttons to ex-
ecute the selection.
12.Set the main switch to “OFF” to cancel the
mode.
13.Disconnect:
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FI diagnostic tool
14.Connect:
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Self-diagnosis signal connector
15.Install:
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Seat
Refer to “GENERAL CHASSIS” on page 4-1.
ADJUSTING THE THROTTLE CABLE FREE
PLAY
NOTE:
Prior to adjusting the throttle cable free play, the
engine idling speed should be adjusted.
1. Check:
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Throttle cable free play “a”
Out of specification
→ Adjust.
2. Adjust:
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Throttle cable free play
Throttle body side
a. Loosen the locknut “1” on the accelerator ca-
ble.
b. Turn the adjusting nut “2” in direction “a” or “b”
until the specified throttle cable free play is
obtained.
c. Tighten the locknut.
NOTE:
If the specified throttle cable free play cannot be
obtained on the throttle body side of the cable,
use the adjusting nut on the handlebar side.
Handlebar side
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.
FI Diagnostic Tool
1400rpm
C1 : -10
3.0–5.0 mm
Direction “a”
Throttle cable free play is increased.
Direction “b”
Throttle cable free play is decreased.
Direction “a”
Throttle cable free play is increased.
Direction “b”
Throttle cable free play is decreased.
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d. Tighten the locknut
e. Slide the rubber cover to its original position.
WARNING
After adjusting the throttle cable free play,
start the engine and turn the handlebar to the
right or left to ensure that this does not
cause the engine idling speed to change.
CHECKING THE SPARK PLUG
1. Remove:
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Right front panel
Refer to “GENERAL CHASSIS” on page 4-1.
2. Disconnect:
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Spark plug cap
3. Remove:
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Spark plug
CAUTION:
Before removing the spark plug, blow away
any dirt accumulated in the spark plug well
with compressed air to prevent it from falling
into the cylinder.
4. Check:
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Spark plug type
Incorrect
→ Change.
5. Check:
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Electrode “1”
Damage/wear
→ Replace the spark plug.
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Insulator “2”
Abnormal color
→ Replace the spark plug.
Normal color is medium-to-light tan.
6. Clean:
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Spark plug
(with a spark plug cleaner or wire brush)
7. Measure:
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Spark plug gap “a”
(with a wire thickness gauge)
Out of specification
→ Regap.
8. Install:
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Spark plug
NOTE:
Before installing the spark plug, clean the spark
plug and gasket surface.
9. Connect:
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Spark plug cap
10.Install:
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Right front panel
Refer to “GENERAL CHASSIS” on page 4-1.
CHECKING THE IGNITION TIMING
NOTE:
Prior to checking the ignition timing, check the
wiring connections of the entire ignition system.
Make sure all connections are tight and free of
corrosion.
1. Remove:
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Timing mark accessing screw “1”
1
2
3 b
a
Spark plug gap
0.7–0.8 mm
T
R
.
.
Spark plug
13 Nm (1.3 m·kg, 9.4 ft·lb)
1
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