Yamaha YZ250 Owner's Service Manual page 160

2. Inspect:
• Shift cam "1"
• Segment "2"
Wear/damage → Replace.
3. Check:
• Shift fork movement
Unsmooth operation → Replace shift fork.
For a malfunctioning shift fork, replace not only
the shift fork itself but the two gears each adja-
cent to the shift fork.
INSTALLING THE TRANSMISSION
1. Install:
• 5th pinion gear (21T/YZ250) (25T/YZ250X)
"1"
• 3rd pinion gear (18T/YZ250) (16T/YZ250X)
"2"
• Collar "3"
• 4th pinion gear (22T/YZ250) (20T/YZ250X)
"4"
• 2nd pinion gear (15T) "5"
To main axle "6".
Apply the molybdenum disulfide oil on the inner
and end surface of the idler gear and on the in-
ner surface of the sliding gear, then install.
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TRANSMISSION, SHIFT CAM AND SHIFT FORK
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2. Install:
• 2nd wheel gear (23T) "1"
• 4th wheel gear (24T/YZ250) (21T/YZ250X)
"2"
• 3rd wheel gear (23T/YZ250) (21T/YZ250X)
"3"
• 5th wheel gear (20T/YZ250) (21T/YZ250X)
"4"
• 1st wheel gear (27T) "5"
• O-ring "6"
To drive axle "7".
• Apply the molybdenum disulfide oil on the in-
ner and end surface of the idler gear and on
the inner surface of the sliding gear, then in-
stall.
• Apply the lithium soap base grease on the O-
ring.
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