Yamaha MBK MW125 2014, Service Manual

Page: 292 / 380

THROTTLE BODY
7-9
EAS30479
CHECKING THE THROTTLE BODY
TIP
• Before checking the throttle body, check the
following items:
• Valve clearance
• Spark plug
• Air filter element
• Intake manifold
• Fuel hose
• Exhaust system
• Cylinder head breather hose
WARNING
EWA18030
If the throttle body is subjected to strong
shocks or dropped during, replace it.
1. Check:
• Throttle body
Cracks/damage
→
Replace the throttle body.
2. Check:
• Butterfly valve
Damage/scratches/wear
→
Replace the
throttle body.
NOTICE
ECA21770
Do not adjust the stop screw “1”.
EAS31254
CLEANING THE ISC (IDLE SPEED
CONTROL) UNIT AND THROTTLE BODY
1. Remove the throttle body from the vehicle.
2. Remove:
• Screw “1”
• Plate “2”
• ISC (idle speed control) unit “3”
NOTICE
ECA21780
Because the force of the spring may push
out the ISC unit unexpectedly, be sure to
hold the ISC unit when removing the compo-
nents.
3. Remove:
• Spring “1”
• O-ring “2”
4. Check:
• ISC (idle speed control) unit
Plunger “1” does not rotate smoothly/plunger
rotates together with the motor shaft “2”
→
Replace.
5. Check:
• Spring
Damage/bent
→
Replace.
6. Clean:
• Area “a” of the ISC unit
• Areas “b” and “c” of the throttle body
Clogs or foreign materials cannot be re-
moved
→
Replace.
1
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1
2
1
2
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