Derbi GPR125 Workshop Manual page 116

4-stroke
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4 - ENGINE
Roll the guide bar on a flat surface.
Warping => Renew.
CAUTION
4. Check:
- Movement of the gear change forks (in the guide bar)
Uneven movement => Renew the fork and the bar.
N.B.
5. Inspect:
- Gear teeth.
Blue colouring/grooves/wear => Renew.
- Gear claws
Rounded edges/cracks/pieces missing =>Renew.
6. Check:
- Length of the secondary shaft pack (A):
92'2mm (+010 - 0,18mm).
116
DO NOT TRY AND STRAIGHTEN
A WARPED BAR.
IF THE GEAR CHANGE FORK
AND THE DRIVE SPROCKETS
ARE DAMAGED, RENEW THE
SPROCKETS TO EITHER SIDE
ALL TOGETHER.
A

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