Chain Drive; Removing The Drive Chain; Checking The Drive Chain - Yamaha SR400 2014 Service Manual

EAS23400

CHAIN DRIVE

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.
TIP
Place the vehicle on a suitable stand so that the
rear wheel is elevated.
2. Remove:
• Rear wheel
Refer to "REAR WHEEL" on page 4-11.
• Swingarm
Refer to "REAR SHOCK ABSORBER AS-
SEMBLY AND SWINGARM" on page 4-48.
3. Remove:
• Drive sprocket cover "1"
• Drive chain "2"
2
EAS23441

CHECKING THE DRIVE CHAIN

1. Measure:
• 15-link section of the drive chain
Out of specification  Replace the drive
chain.
15-link length limit
191.5 mm (7.54 in)
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a. Measure the length "a" between the inner
sides of the pins and the length "b" between
the outer sides of the pins on a 15-link section
of the drive chain as shown in the illustration.
b. Calculate the length "c" of the 15-link section
of the drive chain using the following formula.
Drive chain 15-link section length "c" =
(length "a" between pin inner sides + length
"b" between pin outer sides)/2
TIP
• When measuring a 15-link section of the drive
chain, make sure that the drive chain is taut.
• Perform this procedure 2–3 times, at a different
location each time.
1
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2. Clean:
• Drive chain
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a. Wipe the drive chain with a clean cloth.
b. Put the drive chain in kerosene and remove
any remaining dirt.
c. Remove the drive chain from the kerosene
and completely dry it.
4-53
CHAIN DRIVE