Yamaha XV19SX(C), Service Manual

Page: 139 / 494

CHASSIS
3-26
EAS21430
ADJUSTING THE DRIVE BELT SLACK
NOTE:
The drive belt slack must be checked at the tight-
est point on the belt.
CAUTION:
ECA14950
A drive belt 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 belt slack within the specified lim-
its.
NOTE:
Measure the drive belt slack when the engine is
cold, and when the drive belt is dry.
1. Stand the vehicle on a level surface.
WARNING
EWA13120
Securely support the vehicle so that there is
no danger of it falling over.
NOTE:
Place the vehicle on the sidestand and or on a
suitable stand so that the rear wheel is elevated.
2. Check:
• Drive belt slack “a”
Out of specification
→
Adjust.
NOTE:
• The level marks of the level window on the low-
er drive belt cover are in units of 5 mm (0.20 in).
Use them as a standard for measuring the
drive belt slack.
• Measure the drive belt slack when the drive
belt has been pushed with 4.5 kg (10 lbs) of
pressure using a belt tension gauge “1”.
3. Remove:
• Muffler
Refer to “ENGINE REMOVAL” on page 5-1.
4. Adjust:
• Drive belt slack
▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼ ▼▼▼ ▼ ▼▼▼
NOTE:
Place the vehicle on a suitable stand so that the
rear wheel is elevated.
a. Loosen the wheel axle nut “1”.
b. Loosen both locknuts “2”.
c. Turn both adjusting bolts “3” in direction “a” or
“b” until the specified drive belt slack is ob-
tained.
Drive belt slack (on the side-
stand)
7.5–13 mm (0.30–0.51 in)
Drive belt slack (on a suitable
stand)
14–21 mm (0.55–0.83 in)
Belt tension gauge
90890-03170
Rear drive belt tension gauge
YM-03170
a
Direction “a”
Drive belt is tightened.
Direction “b”
Drive belt is loosened.
1
1