Yamaha WR250FM service manual Transmission, Gears

TRANSMISSION, SHIFT CAM AND SHIFT FORK

ENG

EC4H3000

REMOVAL POINTS

EC4H3230

Transmission

1.Remove:

•Main axle 1

•Drive axle 2

•Shift cam

•Shift fork 3

•Shift fork 2

•Shift fork 1

NOTE:

•Remove assembly with the collar 3 installed to the crankcase.

•Remove assembly carefully. Note the posi- tion of each part. Pay particular attention to the location and direction of shift forks.

•Remove the main axle, drive axle, shift cam and shift fork all together by tapping lightly on the transmission drive axle with a soft ham- mer.

EC4H4000

INSPECTION

EC4H4200

Gears

1.Inspect:

•Matching dog a

•Gear teeth b

•Shift fork groove c Wear/damage → Replace.

2.Inspect:

•O-ring 1

Damage → Replace.

3.Check:

•Gears movement

Unsmooth movement → Repair or replace.

EC4H4600

Bearing

1.Inspect:

•Bearing 1

Rotate inner race with a finger. Rough spot/seizure → Replace.

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