Yamaha MA190 Service Manual page 60

3 Check connecting rod
If connecting rod bending, twisting or big end
shaft bush and small end outer ring movement
or crack on one side, should be rejected and
replaced with new one.
Bolt
TIP
Place the plastic gauge axially.
55
a. Check small end diameter
If out of the standard or exceed service
limit, replace the connecting rod.
Standard
16.005–16.021 mm
b. Check big end diameter
If out of the standard or exceed service
limit, replace the connecting rod.
Standard
30.000–30.018 mm
c. Connecting rod big end oil clearance
9 Wipe oil off the crank pin and connect-
ing rod bearing mating surface.
9 Set the plastic gauge on the crank pin,
connecting rod and bolt to specified
torque.
Bolt:
13±1 N·m
4-3 Engine
Service limit
16.090 mm
Service limit
30.066 mm