Yamaha SR400 2014 Service Manual page 171

4. Adjust:
• Drive chain slack
Refer to "ADJUSTING THE DRIVE CHAIN
SLACK" on page 3-18.
Drive chain slack
30.0–40.0 mm (1.18–1.57 in)
ECA13550
NOTICE
A drive chain that is too tight will overload
the engine and other vital parts, and one that
is too loose can skip and damage the swing-
arm or cause an accident. Therefore, keep
the drive chain slack within the specified lim-
its.
4-55
CHAIN DRIVE