Yamaha VINO 125 Service Manual download pdf (Page 191)

ENG

5-30

EAS00261*

CHECKING THE CYLINDER AND PISTON

1. Check:

8piston wall

8cylinder wall

Vertical scratches J Replace the cylin-

der, and the piston and piston rings as a

set.

2. Measure:

8piston-to-cylinder clearance

*****************************************************

a. Please carry out the following inspections:

8cylinder

Measure the piston pin in both of its hori-

zontal axis direction a and its right angle

direction b at six positions of A, B, C, etc.

with a cylinder gauge.

Abrasion = Max. value - min. value as

measured at those six positions

When abrasion is beyond limit J Replace

Standard value of cylinder inner di-

ameter

52.40~52.41mm (2.063~2.064 in)

Service limit of cylinder inner diam-

eter

52.5mm (2.067 in)

b. If out of specification, replace the cylinder,

and the piston and piston rings as a set.

c. Measure piston skirt diameter “P” with the

micrometer.

a 3.5 mm(0.138 in) from the bottom edge of

the piston

Piston size “P”

51.470 ~ 51.510 mm(2.026~ 2.028 in)

d. If out of specification, replace the piston and

piston rings as a set.

e. Calculate the piston-to-cylinder clearance

with the following formula.

Piston-to-cylinder clearance =

Cylinder bore “C” - Piston skirt diameter “P”

Piston-to-cylinder clearance

0.01 ~ 0.03 mm(0.0004~0.0012 in)

<Limit>: 0.15 mm(0.006 in)

f. If out of specification, replace the cylinder,

and the piston and piston rings as a set.

*****************************************************

CYLINDER AND PISTON

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Yamaha VINO 125 Service Manual Page 191

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