Lubricating The Drive Chain - Yamaha YZF-R25 Service Manual

2. Move the rear wheel several times and find
the tightest position of the drive chain.
3. Check:
• Drive chain slack
Out of specification → Adjust.
TIP
Measure the drive chain slack "a" as shown in
the illustration.
a
Drive chain slack
35.0–45.0 mm (1.38–1.77 in)
Limit
**
4. Remove the drive chain puller cap "1", and
then loosen the axle nut "2".
5. Adjust:
• Drive chain slack
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a. Loosen both of the drive chain puller locknuts
"1".
b. Turn both of the drive chain puller adjusting
nuts "2" in direction "a" or "b" until the speci-
fied drive chain slack is obtained.
Direction "a"
Drive chain is tightened.
Direction "b"
Drive chain is loosened.
2
1
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PERIODIC MAINTENANCE
TIP
• Using the alignment marks "c" on each side of
the swingarm, make sure that both drive chain
pullers "3" are in the same position for proper
wheel alignment.
• There should be no clearance between the
swingarm end plate and the adjusting nuts.
c. Tighten the wheel axle nut to specification.
d. Tighten the drive chain puller adjusting nuts
and the drive chain puller locknuts to specifi-
cation.
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EAS30803

LUBRICATING THE DRIVE CHAIN

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
vehicle is used in dusty areas.
This vehicle has a drive chain with small rubber
O-rings between each side plate. Steam clean-
ing, high-pressure washing, certain solvents,
and the use of a coarse brush can damage
3-18
a
b
Rear wheel axle nut
57 Nm (5.7 m·kgf, 41 ft·lbf)
Drive chain puller adjusting nut
1.5 Nm (0.15 m·kgf, 1.1 ft·lbf)
Drive chain puller locknut
16 Nm (1.6 m·kgf, 12 ft·lbf)
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2
1
3
c
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