Yamaha TZ250M1 Owner's Service Manual page 157

TRANSMISSION, SHIFT CAM AND SHIFT FORK
EC4H4501
Dog clearance
NOTE:
• It is necessary to adjust the dog clearance
when the transmission gear, axle, washer, cir-
clip, bearing or crankcase is replaced.
• If there is any shifting trouble, it is necessary
to check the shift fork, shift cam, shift lever
and gears. But if there are in good condition,
the dog clearance should be inspected.
1. Install the transmission, shift cam and shift
fork into the transmission housing.
2. Position the transmission is neutral.
3. Pull the main axle toward the clutch side.
4. Bring the 3rd/4th pinion gear 1 into light
contact with the 6th pinion gear 2 to the
extent that they are not engaged, and mea-
sure the clearance a between 3rd/4th pin-
ion gear and 6th pinion gear.
Bring the 3rd/4th pinion gear into light con-
tact with the 5th pinion gear 3 to the extent
a
that they are not engaged and measure the
clearance b between 3rd/4th pinion gear
and 5th pinion gear.
Dog clearance a a , b b :
0.5 mm (0.020 in) or more
Out of specification or clearance a and b
are not equal ≥ Replace the shim 4.
Choose the shim by the following chart.
M
Part name Size (thickness) Part number
Shim 4 4 STD t=1.0 mm
t=0.9 mm
EC4H4600
Bearing
1. Inspect:
• Bearing 1
Rotate inner race with a finger.
Rough spot/Seizure ≥ Replace.
4-59
ENG
90201-253K0
(0.039 in)
90201-256E6
(0.035 in)