Adjusting The Drive Chain Slack; Lubricating The Drive Chain - Yamaha SR400 2014 Service Manual

2
EAS21390

ADJUSTING THE DRIVE CHAIN SLACK

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.
TIP
The drive chain slack must be checked at the
tightest point on the chain.
1. Stand the vehicle on a level surface.
EWA13120
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
TIP
Place the vehicle on a suitable stand so that the
rear wheel is elevated.
2. Move the rear wheel several times and find
the tightest position of drive chain.
3. Check:
• Drive chain slack "a"
Out of specification  Adjust.
Drive chain slack
30.0–40.0 mm (1.18–1.57 in)
4. Adjust:
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1
a. Loosen wheel axle nut "1".
b. Loosen the brake pedal free play adjusting
c. Loosen both locknuts "2".
d. Turn the adjusting bolts "3" in direction "a" or
TIP
• To maintain the proper wheel alignment, adjust
• Align matching marks "c" with the same posi-
e. Tighten the wheel axle nut to specification.
f. Tighten the locknuts to specification.
g. Tighten the tension bar nut to specification.
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EAS21440

LUBRICATING THE DRIVE CHAIN

a
The drive chain consists of many interacting
parts. If the drive chain is not maintained proper-
ly, it will wear out quickly. Therefore, the drive
chain should be serviced, especially when the
3-18
PERIODIC MAINTENANCE
• Drive chain slack
nut and tension bar nut.
"b" until the specified drive chain slack is ob-
tained.
Direction "a"
Drive chain is tightened.
Direction "b"
Drive chain is loosened.
3
2
1
both sides evenly.
tion.
Wheel axle nut
129 Nm (12.9 m·kgf, 93 ft·lbf)
Locknut
16 Nm (1.6 m·kgf, 12 ft·lbf)
Tension bar nut
19 Nm (1.9 m·kgf, 14 ft·lbf)
c