Checking The Big End Bearings - Yamaha YZF-R1S Service Manual

CONNECTING RODS AND PISTONS
2. Measure:
3. Measure:
4. Calculate:

CHECKING THE BIG END BEARINGS

1. Measure:
The following procedure applies to all of the
connecting rods.
5-82
S piston pin outside diameter a
Out of specification ! Replace the piston
pin.
Piston pin outside diameter
16.991 X 17.000 mm
(0.6689 X 0.6693 in)
<Limit>: 16.971 mm (0.6682 in)
S piston pin bore inside diameter b
Out of specification ! Replace the piston.
Piston pin bore inside diameter
17.002 X 17.013 mm
(0.6694 X 0.6698 in)
<Limit>: 17.043 mm (0.6710 in)
S piston-pin-to-piston clearance
Out of specification ! Replace the piston pin
and piston as a set.
Piston-pin-to-piston clearance =
Piston pin bore size –
Piston pin outside diameter
Piston-pin-to-piston clearance
0.002 X 0.022 mm
(0.0001 X 0.0009 in)
<Limit>: 0.072 mm (0.0028 in)
S crankshaft-pin-to-big-end-bearing
ance
Out of specification ! Replace the big end
bearings.
Crankshaft-pin-to-big-end-bearing
clearance
0.034 X 0.058 mm
(0.0013 X 0.0023 in)
<Limit>: 0.09 mm (0.0035 in)
ENG
clear-