Crankshaft and Connecting Rods
If the clearance is within the standard, no bearing replace-
ment is required.
If the clearance is between 0.061 mm (0.0024 in.) and the
service limit (0.09 mm, 0.0035 in.), replace the bearing in-
serts [A] with inserts painted blue and purple [B]. Check
insert/journal clearance with the plastigage. The clear-
ance may exceed the standard slightly, but it must not be
less than the minimum in order to avoid bearing seizure.
If the clearance exceeds the service limit, measure the
diameter of the crankshaft main journal.
Crankshaft Main Journal Diameter
30.984 ∼ 31.000 mm (1.2198 ∼ 1.2205 in.)
Service Limit: 30.96 mm (1.2189 in.)
If any journal has worn past the service limit, replace the
crankshaft with a new one.
If the measured journal diameters [C] are not less than the
service limit, but do not coincide with the original diameter
markings [D] on the crankshaft, make new marks on it.
Crankshaft Main Journal Diameter Marks
None 30.984 ∼ 30.992 mm (1.2198 ∼ 1.2202 in.)
30.993 ∼ 31.000 mm (1.2202 ∼ 1.2205 in.)
: Crankshaft Main Journal Diameter Marks, "1" or no
Measure the main bearing inside diameter, and mark the
upper crankcase half in accordance with the inside diam-
[A]: Crankcase Main Bearing Inside Diameter Marks, "
or no mark.
Tighten the crankcase bolts to the specified torque (see
The mark already on the upper crankcase half should
almost coincide with the measurement.
Crankcase Main Bearing Inside Diameter Marks
34.000 ∼ 34.008 mm (1.3386 ∼ 1.3389 in.)
None 34.009 ∼ 34.016 mm (1.3389 ∼ 1.3392 in.)
Select the proper bearing insert [A] in accordance with the
combination of the crankcase and crankshaft coding.
Size Color [B]