Checking The Exup Servo Motor; Checking The Decompression Solenoid - Yamaha MT-01 Service Manual

Manuals by Motomatrix / www.motomatrix.co.uk
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a. Insert a plug "1" into the fuel return hose end.
b. Fill the fuel tank.
c. Put the end of the fuel hose "2" into an open
container.
d. Connect the battery (DC 12 V) to the fuel
pump terminal as shown.
• Positive battery lead →
red/blue "3"
• Negative battery lead →
black "4"
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4
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e. Check the fuel pump operation.
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EAS28360

CHECKING THE EXUP SERVO MOTOR

1. Check:
• EXUP servo motor operation
Out of specification → Replace.
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a. Disconnect the EXUP cables from the EXUP
servo motor pulley.
b. Disconnect the EXUP servo motor coupler
from the EXUP servo motor.
c. Connect the battery leads to the EXUP servo
motor terminal as shown.
Email: info@motomatrix.co.uk
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ELECTRICAL COMPONENTS
For counterclockwise rotation "a"
• Positive battery lead →
black/green "1"
• Negative battery lead →
black/red "2"
For clockwise rotation "b"
• Positive battery lead →
black/red "2"
• Negative battery lead →
black/green "1"
b
a
d. Check that the EXUP servo motor pulley ro-
tates several times in directions "a" and "b".
EC5YU1023
CAUTION:
To prevent damaging the EXUP servo motor,
perform this test within a few seconds of
connecting the battery.
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EAS28400
CHECKING THE DECOMPRESSION
SOLENOID
1. Check:
• Decompression solenoid (thermistor) resis-
tance
Out of specification → Replace.
Decompression solenoid
(thermistor) resistance
56–84 Ω at 25 °C (77 °F)
NOTE:
The resistance value for the thermistor changes
when the temperature changes; therefore, mea-
sure the decompression solenoid (thermistor)
resistance at the specified temperature.
7-105
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B/G B/R
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