Checking The Wheel Bearings/Swingarm Operation; Lubricating The Swingarm Pivot; Adjusting The Drive Chain Slack - Yamaha YZF-R25 Service Manual

EWA14090
WARNING
After extensive tests, the tires listed below
have been approved by Yamaha Motor Co.,
Ltd. for this model. The front and rear tires
should always be by the same manufacturer
and of the same design. No guarantee con-
cerning handling characteristics can be giv-
en if a tire combination other than one
approved by Yamaha is used on this vehicle.
Front tire
Size
110/70-17M/C (54S)
Manufacturer/model
IRC/RX-01F
Manufacturer/model
**
Rear tire
Size
140/70-17M/C (66S)
Manufacturer/model
IRC/RX-01R
Manufacturer/model
**
EWA13210
WARNING
New tires have a relatively low grip on the
road surface until they have been slightly
worn. Therefore, approximately 100 km
should be traveled at normal speed before
any high-speed riding is done.
TIP
For tires with a direction of rotation mark "1":
• Install the tire with the mark pointing in the di-
rection of wheel rotation.
• Align the mark "2" with the valve installation
point.
2
EAS30641
CHECKING THE WHEEL BEARINGS
The following procedure applies to all of the
wheel bearings.
1. Check:
• Wheel bearings
EAS30802
CHECKING THE SWINGARM OPERATION
1. Check:
• Swingarm operation
2. Check:
• Swingarm excessive play
EAS30643

LUBRICATING THE SWINGARM PIVOT

1. Lubricate:
• Bearings
• Spacer
• Dust covers
EAS30644

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.
1
1. Stand the vehicle on a level surface.
EWA13120
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.
3-17
PERIODIC MAINTENANCE
Refer to "CHECKING THE FRONT WHEEL"
on page 4-20 and "CHECKING THE REAR
WHEEL" on page 4-27.
Swingarm not working properly → Check the
swingarm.
Refer to "SWINGARM AND REAR SHOCK
ABSORBER ASSEMBLY" on page 4-74.
Refer to "SWINGARM AND REAR SHOCK
ABSORBER ASSEMBLY" on page 4-74.
Recommended lubricant
Lithium-soap-based grease
Refer to "INSTALLING THE SWINGARM" on
page 4-77.
WARNING