Yamaha TZR50 '03 Service Manual page 196

REAR WHEEL SPROCKET AND DRIVE CHAIN
4. Install:
• The drive chain
• The coupling link of the chain
• The chain clip
Rotation direction
s WARNING
s
Make sure that the clip is installed in the
right position. Otherwise the transmission
chain would open.
5. Adjust:
• The chain slack
See the section on "TIGHTENING The
TRANSMISSION CHAIN" in CHAPTER
3.
Drive chain slack:
20 ~ 25 mm
7-50
CHAS