Checking The Crankshaft - Yamaha EK25BMH Service Manual

POWR
CRANKSHAFT AND CYLINDER BODY
NOTE:
Push the piston ring into the cylinder with
the piston crown.
3. Measure:
• Piston ring side clearance
(use a thickness gauge)
Out of specification → Replace.
Piston ring side clearance
Top: 0.03 - 0.05 mm
2nd: 0.03 - 0.07 mm
NOTE:
When measuring the piston ring side clear-
ance, the outside of the piston ring should
be flush with the piston wall.

CHECKING THE CRANKSHAFT

1. Measure:
• Crank width
(use the digital caliper)
Out of specification →
Repair/replace.
Crank width
56.90 - 56.95 mm
(2.2401 - 2.2421 in)
Crank width
153.7 - 154.0 mm
(6.0512 - 6.0630 in)
Crank width
39.9 - 40.1 mm
(1.5709 - 1.5787 in)
5-34
(0.0012 - 0.0020 in)
(0.0012 - 0.0028 in)
a
b
c
E
b