Yamaha F100A, Service Manual

Page: 232 / 463

5-44
POWR
E
CRANKSHAFT AND PISTON/
CONNECTING ROD ASSY.
2. Adjust:
●
Big-end oil clearance
NOTE:
Adjust the big-end oil clearance at room
temperature (20 ˚C (68 ˚F)).
Adjusting steps:
●
Install the new yellow bearings into
the connecting rods and connecting
rod caps.
●
Put a piece of Plastigauge

onto the
crank pin in parallel to the crankshaft.
●
Assemble the connecting rod onto the
crank pin.
●
Apply engine oil onto the threads and
seat of the original connecting rod
bolts.
●
Tighten the original bolts to the speci-
fied torque in two stages.
T
R
.
.
Bolt:
1st: 8 Nm (0.8 m • kg, 5.8 ft • lb)
2nd: 90˚
●
Remove the connecting rod cap.
●
Measure the width of the compressed
Plastigauge

on each crank pin.
●
Select the suitable bearing from the
table below according to the measure-
ment values.
a
CAUTION:
Remove any oil or dust from the connect-
ing-rod-bearing mounting surfaces.
NOTE:
●
Make sure the large, flat side
a
on the
connecting rod faces towards the fly-
wheel side.
●
Do not move the crankshaft until the big-
end oil clearance measurement has been
completed.