Yamaha TZ250M1 Owner's Service Manual page 156

TRANSMISSION, SHIFT CAM AND SHIFT FORK
EC4H4300
Shift fork groove
1. Measure:
• 3rd/4th pinion gear 1
• 5th wheel gear 2
• 6th wheel gear 3
• Shift fork groove a
Out of specification ≥ Replace.
]
Shift fork groove a a :
Standard
5.05~5.18 mm
(0.199~0.204 in)
EC4H4400
Thrust clearance
1. Check:
• After assembling the transmission, check
whether the idle gear turns smoothly with-
out a thrust.
If the thrust clearance is too large or the idle
gear moves with difficulty ≥ Replace the
shim 1, 2 and 3.
Choose the shims by the following chart.
Part name Size (thickness) Part number
Shim 1 1 STD t=1.0 mm
t=0.9 mm
Shim 2 2 STD t=1.0 mm
t=0.9 mm
N
Shim 3 3 STD t=0.7 mm
t=0.5 mm
NOTE:
It is necessary to adjust the thrust clearance
when the transmission gear, axle, washer, cir-
clip, bearing or crankcase is replaced.
4-58
ENG
<Limit>
5.35 mm
(0.211 in)
90201-253K0
(0.039 in)
90201-256E6
(0.035 in)
90201-20276
(0.039 in)
90201-206E5
(0.035 in)
5F7-17136-00
(0.028 in)
90209-22082
(0.020 in)