Checking The Engine Idling Speed; Checking The Throttle Body Joint; Adjusting The Exhaust Gas Volume - Yamaha SR400 2014 Service Manual

• Crankcase cover (left)
Refer to "GENERATOR" on page 5-46.
• Fuel tank
Refer to "FUEL TANK" on page 6-1.
• Seat
Refer to "GENERAL CHASSIS" on page 4-1.
7. Adjust:
• Decompression lever free play
Refer to "ADJUSTING THE DECOMPRES-
SION LEVER FREE PLAY" on page 3-11.
EAS2RD1006

CHECKING THE ENGINE IDLING SPEED

TIP
Prior to checking the engine idling speed, the air
filter element should be clean, and the engine
should have adequate compression.
1. Start the engine and let it warm up for several
minutes.
2. Install:
• Digital tachometer
(To the spark plug lead)
Digital tachometer
90890-06760
Digital tachometer
YU-39951-B
3. Measure:
• Engine idling speed
Out of specification  Replace the throttle
body.
Engine idling speed
1200–1400 r/min
EAS21020

CHECKING THE THROTTLE BODY JOINT

1. Remove:
• Throttle body
Refer to "THROTTLE BODY" on page 6-9.
2. Check:
• Throttle body joint "1"
Cracks/damage  Replace.
1
PERIODIC MAINTENANCE
3. Install:
• Throttle body
Refer to "THROTTLE BODY" on page 6-9.
EAS20600

ADJUSTING THE EXHAUST GAS VOLUME

TIP
Be sure to set the CO density level to standard,
and then adjust the exhaust gas volume.
1. Adjust:
• Exhaust gas volume
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Turn the main switch to "OFF".
b. Connect the self-diagnosis signal coupler "1"
to the FI diagnostic tool "2" as shown.
TIP
Remove the cap from the self-diagnosis signal
coupler before connecting the FI diagnostic tool.
FI diagnostic tool
90890-03182
FI diagnostic tool
YU-03182
1
c. While pressing the "MODE" button "1", turn
the main switch to "ON".
TIP
• "DIAG" appears on the LCD display "2" of the
FI diagnostic tool.
• "POWER" LED (green) "3" comes on.
3-7
1
2