Yamaha WR250F 2017 Owner's Service Manual page 225

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a. When press fitting the connecting plate "1",
make sure the space "a" between the end of
the connecting pin "2" and the connecting
plate is 1.2–1.4 mm (0.05–0.06 in).
b. After riveting, make sure the diameter be-
tween the edges "b" of the connecting pin "2"
is 5.5–5.8 mm (0.22–0.23 in).
c. After riveting, make sure the space "c",
which is inside of the connecting link "3" and
inside of the connecting plate "1", is 14.1–
14.3 mm (0.56–0.65 in).
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2. Lubricate:
• Drive chain
Recommended lubricant
Chain lubricant suitable for O-
ring chains
3. Install:
• Drive sprocket
• Lock washer
• Drive sprocket nut
Refer to "ENGINE REMOVAL" on page 6-1.
Drive sprocket nut
75 Nm (7.5 m·kgf, 54 ft·lbf)
ECA
NOTICE
Never install a new drive chain onto worn
drive chain sprockets; this will dramatically
shorten the drive chain's life.
4. Adjust:
• Drive chain slack
Refer to "ADJUSTING THE DRIVE CHAIN
SLACK" on page 3-31.
Drive chain slack (on a suitable
stand)
50.0–60.0 mm (1.97–2.36 in)
ECA
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
swingarm or cause an accident. Therefore,
keep the drive chain slack within the speci-
fied limits.
5-71
CHAIN DRIVE
New