Yamaha YZ450F(B) 2012 Owner's Service Manual page 135

3. Inspect:
• Oil seal
Damage → Replace.
CHECKING THE CRANKSHAFT
1. Measure:
• Runout limit "a"
• Small end free play limit "b"
• Connecting rod big end side
clearance "c"
• Crank width "d"
Out of specification → Replace.
Use the dial gauge and a thick-
ness gauge.
Dial gauge and stand:
YU-3097/90890-01252
Standard
Runout 0.03 mm
limit: (0.0012 in)
Small
0.4–1.0 mm
end
(0.016–0.039
free
in)
play:
0.15–0.45
Side
mm
clear-
(0.0059–0.01
ance:
77 in)
61.95–62.00
Crack mm
width: (2.439–2.441
in)
CHECKING THE OIL STRAINER
1. Inspect:
• Oil strainer
Damage → Replace.
INSTALLING THE CRANKCASE
BEARING
1. Install:
• Bearing
• Bearing stopper
• Bolt (bearing stopper)
• Screw (bearing stopper)
• Screw [bearing stopper (crank-
shaft)] "1"
<Limit>
0.05 mm
(0.002 in)
To left and right crankcase.
2.0 mm
(0.08 in)
• Install the bearing by pressing its
outer race parallel.
• To prevent the screw [bearing stop-
per (crankshaft)] from becoming
0.50 mm
loose, crush the screw head periph-
(0.02 in)
ery "a" into the concave "b" using a
punch etc. In so doing, take care
not to damage the screwdriver re-
—
ceiving hole in the screw head.
INSTALLING THE CRANKSHAFT
1. Install:
• Crankshaft "1"
Use the crankshaft installing tool
"2", "3", "4" and "5".
CRANKCASE AND CRANKSHAFT
Bolt (bearing stopper):
10 Nm (1.0 m•kg, 7.2
ft•lb)
Screw (bearing stopper):
10 Nm (1.0 m•kg, 7.2
ft•lb)
Screw [bearing stopper
(crankshaft)]:
22 Nm (2.2 m•kg, 16
ft•lb)
Crankshaft installing pot
"2":
YU-90050/90890-01274
Crankshaft installing bolt
"3":
YU-90050/90890-01275
Adapter (M12) "4":
YU-90063/90890-01278
Spacer (crankshaft in-
staller) "5":
YM-91044/90890-04081
4-54
• Hold the connecting rod at top dead
center with one hand while turning
the nut of the installing tool with the
other. Operate the installing tool un-
til the crankshaft bottoms against
the bearing.
• Before installing the crankshaft,
clean the contacting surface of
crankcase.
• Apply the molybdenum disulfide
grease to the crankshaft to pre-
vent it from being scratched.
• Do not use a hammer to drive in
the crankshaft.
A. For USA and CDN
B. Except for USA and CDN
2. Check:
• Shifter operation
• Transmission operation
Unsmooth operation → Repair.