Yamaha F400A 2022 - Page 439

Shimming (regular rotation model)
8-40
TIP:
• Measure the distance at 4 points: “a”, “b”,
“c”, and “d”, turning the drive shaft 90°
clockwise after each measurement.
• Write down the measurement data in the
shimming check sheet.
e. Determine the distance average, and
then round down the average to the 1/
100 place.
Example:
(mm)
5. Select:
• Pinion shim (T3)
a. Determine the pinion shim (T3) thick-
ness adjustment using the pinion shim
(T3) selection table. See “Pinion shim
(T3) selection table” (A-25).
TIP:
Adjust the shim thickness to obtain the pinion
distance of 0.75 mm.
Example:
Pinion distance measurement = 0.70
mm “a”
Pinion shim (T3) thickness adjustment
= 0.05 mm “b”
The current shim thickness must be in-
creased by 0.05 mm.
b. Calculate the new pinion shim (T3)
thickness.
TIP:
• Use up to 3 shims to obtain the required
shim thickness. However, if the pinion shim
thickness is 1.21 mm or more, 4 shims may
be used.
• If the calculated shim thickness cannot be
obtained with a combination of the available
shims, increase or decrease the pinion dis-
tance measurement by 0.01 mm.
Calculation formula:
New pinion shim (T3) thickness = Cur-
rent pinion shim thickness + Shim
thickness adjustment
Example:
Use the following formula when the
shim thickness adjustment value is
positive.
Current pinion shim thickness = 0.70
mm
Shim thickness adjustment = 0.18 mm
New pinion shim (T3) thickness = 0.70
mm + 0.18 mm = 0.88 mm
Use the following formula when the
shim thickness adjustment value is
negative.
Current pinion shim thickness = 0.70
mm
Shim thickness adjustment = -0.09 mm
New pinion shim (T3) thickness = 0.70
mm + (-0.09) mm = 0.61 mm
Measuring point “a” 0.70
Measuring point “b” 0.71
Measuring point “c” 0.71
Measuring point “d” 0.69
Average 0.7025
Round-down average 0.70
a
c
bd
A. Pinion distance measurement
B. Shim thickness adjustment
A
0.69 0.70 0.71
B
+0.06 +0.05 +0.04
(mm)
ab