Adjusting The Drive Chain Slack; Lubricating The Drive Chain - Yamaha XT250X Service Manual

check the brake operation.
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EAS21420

ADJUSTING THE DRIVE CHAIN SLACK

NOTE:
The drive chain slack must be checked at the
tightest point on the chain.
ECA13550
CAUTION:
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.
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. Spin the rear wheel several times and find the
tightest position of drive chain.
3. Check:
Drive chain slack "a"
G
Out of specification → Adjust.
Drive chain slack
40.0–45.0 mm (1.57–1.77 in)
NOTE:
Measure the drive chain slack in the intermedi-
G
ate position between drive axle center and rear
wheel axle center.
If the chain contacts the drive chain guide, this
G
is the limit of chain slack.
4. Adjust:
G
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
a. Loosen the wheel axle nut "1".
b. Turn the drive chain adjusting plate "2" in di-
Direction "a"
Drive chain is tightened.
Direction "b"
Drive chain is loosened.
NOTE:
To maintain the proper wheel alignment, adjust
both sides evenly.
c. Tighten the wheel axle nut to specification.
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EAS21440

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
a
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
these O-rings. Therefore, use only kerosene to
clean the drive chain. Wipe the drive chain dry
and thoroughly lubricate it with engine oil or
chain lubricant that is suitable for O-ring chains.
Do not use any other lubricants on the drive
chain since they may contain solvents that could
damage the O-rings.
3-20
Drive chain slack
rection "a" or "b" until the specified drive chain
slack is obtained.
a
b
Rear wheel axle nut
85 Nm (8.5 m•kg, 62 ft•lb)
CHASSIS
2
1