Checking The Engine Idling Speed; Checking The Throttle Body Joint And Intake Manifold - Yamaha MBK MW125 2014 Service Manual

2. Check:
• Cylinder head breather hose "1"
• Transmission case breather hose "2"
Cracks/damage → Replace.
Loose connections → Connect properly.
ECA21600
NOTICE
Make sure the cylinder head breather hose
and transmission case breather hose are
routed correctly.
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2
3. Install:
• Storage box
• Center panel
Refer to "GENERAL CHASSIS (1)" on page
4-1 and "GENERAL CHASSIS (2)" on page
4-3.
EAS31017

CHECKING THE ENGINE IDLING SPEED

TIP
Prior to adjusting 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. Check:
• Engine idling speed
Out of specification → Go to next step.
Engine idling speed
1500–1700 r/min
PERIODIC MAINTENANCE
3. Check:
• ISC (idle speed control) learning value
"00" or "01" → Check the intake system.
"02" → Clean the ISC (idle speed control) unit
and throttle body.
Refer to "CLEANING THE ISC (IDLE SPEED
CONTROL) UNIT AND THROTTLE BODY"
on page 7-9.
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a. Connect the Yamaha diagnostic tool.
Use the diagnostic code number "67".
Refer to "SELF-DIAGNOSTIC FUNCTION
AND DIAGNOSTIC CODE TABLE" on page
9-5.
Yamaha diagnostic tool
90890-03231
b. Check the ISC (idle speed control) leaning
value.
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EAS31180
CHECKING THE THROTTLE BODY JOINT
AND INTAKE MANIFOLD
1. Remove:
• Storage box
Refer to "GENERAL CHASSIS (2)" on page
4-3.
2. Check:
• Throttle body joint "1"
• Intake manifold "2"
Cracks/damage → Replace.
3-7
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