Yamaha FZ1-N Service Manual page 317

Out of specification → Replace.
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a. Check whether or not the sub-throttle valve
is seized.
1 Turn the nut of worm shaft of the sub-throt-
tle servo motor by hand to check that the
sub-throttle valve is moved smoothly by
hand.
2 If it is not moved smoothly, disconnect the
link between the sub-throttle servo motor
and sub-throttle valve, and then check
whether or not the sub-throttle valve is
moved smoothly by hand.
Refer to "THROTTLE BODIES" on page 7-
4.
3 When the sub-throttle valve is not moved
smoothly, repair or replace it since the
cause is the seizure of sub-throttle valve
body itself.
When it moved smoothly at Step (1) and
(2), replace the sub-throttle servo motor.
b. Perform the self-diagnosis mode and check
the operation of sub-throttle valve by visual
inspection (Code No: 56).
The operation should be carried out as 5-
second drive in the full open direction, 2-
second stop and 5-second drive in the full
close direction.
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EAT2D1004
CHECKING THE THERMO WAX
1. Check:
• Thermo wax "1"
Damage → Replace the thermo wax
assembly.
ET2D1025
ADJUSTING THE THERMO WAX
1. Adjust:
• Thermo wax the end face distance "a"
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a. Before adjusting the distance, push the rod
"b" in order to be fitted in several times by
hand.
b. Measure the outside air temperature, and
adjust the distance "a" by turning the
adjusting screw "2". Refer to the thermo
wax tolerance table based on the mea-
sured outside air temperature for correct
adjustment.
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NOTE:
• Setup tolerance of the longitudinal axis
should be ± 0.2 mm ( ± 0.008 in).
• After adjusting the thermo wax, check that
the first idling is released at the coolant tem-
perature around 60°C (140°F) by idling.
• If the first idling is not released around 60°C
(140°F), make sure to set it again. (When the
coolant temperature is low, adjust the dis-
tance between the end faces longer or adjust
7-11
THROTTLE BODIES