Transmission And Shifter - Yamaha YFM250XL(C) Service Manual

INSPECTION AND REPAIR

TRANSMISSION AND SHIFTER

Shift fork and guide bar
1.Inspect:
Shift forks
On the gear and shift cam contact sur-
faces.
Wear/Chafing/Bends/Damage → Replace.
2.Inspect:
Guide bars
(Roll the guide bar on a flat surface.
Bends → Replace.
WARNING
Do not attempt to straighten a bent guide
bar.
3.Check:
Shift fork movement
On its guide bar 1.
Unsmooth operation → Replace fork and/
or guide bar.
Shift cam
1.Inspect:
Shift cam grooves 1
Wear/Damage/Scratches → Replace.
Shift cam segment 2
Damage/Wear → Replace.
Shift cam bearing 3
Roughness/Sluggishness → Replace.
Main/drive axle and gears
1.Measure:
Axle runout 1 (main and drive axles)
Use centering device and Dial Gauge 2.
Out of specification → Replace.
Runout Limit:
0.08 mm (0.0031 in)
4 - 41
ENG
4