Checking The Balancer Shaft - Yamaha YZF-R1 2020 Service Manual

EAS31076

CHECKING THE BALANCER SHAFT

1. Measure:
• Balancer shaft runout
Out of specification → Replace the balancer
shaft.
Balancer shaft runout limit
0.030 mm (0.0012 in)
2. Check:
• Balancer shaft journal surfaces
Scratches/wear → Replace the balancer
shaft.
• Bearing surfaces
Scratches/wear → Replace the balancer
shaft journal bearing.
3. Measure:
• Balancer shaft journal-to-balancer shaft jour-
nal bearing clearance
Out of specification → Replace the balancer
shaft journal bearings.
Balancer shaft journal to balanc-
er shaft bearing clearance
0.028–0.046 mm (0.0011–0.0018
in)
ECA18400
NOTICE
Do not interchange the balancer shaft jour-
nal bearings. To obtain the correct balancer
shaft-journal-to-balancer shaft-journal-bear-
CRANKSHAFT AND BALANCER SHAFT
ing clearance and prevent engine damage,
the balancer shaft journal bearings must be
installed in their original positions.
J J J J J
1 2 3 4 5
TIP
Align the projections "a" on the balancer shaft
journal upper bearings with the notches "b" in the
upper crankcase.
TIP
Do not put the Plastigauge® over the oil hole in
the balancer shaft journal.
TIP
• Align the projections "a" of the balancer shaft
• Do not move the balancer shaft until the clear-
5-93
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.
G089019
d. Put a piece of Plastigauge® "1" on each
balancer shaft journal.
G089020
e. Install the balancer shaft journal lower
bearings "1" into the lower crankcase and
assemble the crankcase halves.
journal lower bearings with the notches "b" in
the crankcase.
ance measurement has been completed.
1
a
b
1