Removing The Drive Chain; Checking The Drive Chain - Yamaha XG250 Service Manual

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EAS23420

REMOVING THE DRIVE 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.
NOTE:
Place the vehicle on a suitable stand so that the
rear wheel is elevated.
2. Remove:
Drive sprocket nut "1"
Lock washer "2"
NOTE:
Straighten the lock washer tab.
While applying the rear brake, loosen the
drive sprocket nut.
Loosen the drive sprocket nut, and then re-
move the rear wheel and swingarm.
2
3. Remove:
Swingarm
Refer to "SWINGARM" on page 4-55.
EAS23440

CHECKING THE DRIVE CHAIN

1. Measure:
15-link section "a" of the drive chain
Out of specification → Replace the drive
chain, drive sprocket and rear wheel sprock-
et as a set.
15-link length limit
191.5 mm (7.54 in)
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Measure the length of 15 links on the inner
side "b" and outer side "c" of the pin and cal-
culate the length between pin centers.
b. Length "a" between pin centers = (inner di-
mension "b" + outer dimension "c")/2
c. 15-Link section "a" of the drive chain.
1
NOTE:
While measuring the 15-link section, push
down on the drive chain to increase its ten-
sion.
Perform this measurement at two or three dif-
ferent places.
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
2. Check:
Drive chain
Stiffness → Clean and lubricate or replace.
3. Clean:
Drive chain
4-59
CHAIN DRIVE
a
b
c
1

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