Checking The Balancer Shaft - Yamaha YZFR1Y(C) 2009 Service Manual

EAS14B1027

CHECKING THE BALANCER SHAFT

1. Measure:
• Balancer shaft runout
Out of specification → Replace the bal-
ancer shaft.
Balancer shaft runout limit
0.030 mm (0.0012 in)
2. Check:
• Balancer shaft journal surfaces
• Bearing surfaces
Scratches/wear → Replace the balancer
shaft.
3. Measure:
• Balancer shaft-journal-to-balancer shaft-
journal-bearing clearance
Out of specification → Replace the bal-
ancer shaft journal bearings.
Journal oil clearance
0.012–0.043
0.0017 in)
mm (0.0005–
5-87
ECA14B1020
Do not interchange the balancer shaft jour-
nal bearings. To obtain the correct balancer
shaft-journal-to-balancer shaft-journal-
bearing clearance and prevent engine dam-
age, the balancer shaft journal bearings
must be installed in their original positions.
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a. Clean the balancer shaft journal bearings,
balancer shaft journals, and bearing por-
tions of the crankcase.
b. Place the upper crankcase upside down on
a bench.
c. Install the balancer shaft journal upper
bearings "1" and the balancer shaft into the
upper crankcase.
TIP
Align the projections "a" on the balancer shaft
journal upper bearings with the notches "b" in
the upper crankcase.
d. Put a piece of Plastigauge® "1" on each
balancer shaft journal.
TIP
Do not put the Plastigauge® over the oil hole in
the balancer shaft journal.
e. Install the balancer shaft journal lower
bearings "1" into the lower crankcase and
assemble the crankcase halves.
CRANKSHAFT