Yamaha SR125 1997, Руководство по обслуживанию

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4-22
CYLINDER AND PISTON
ENG
***************************************
Cylinder bore “C” 57.00 57.02 mm
Taper limit “T” 0.05mm
Out of round “R” 0.01mm
“C” = Maximum D
“T” = (Maximum D
1
or D
2
) –
(Maximum D
5
or D
6
)
“R” = (Maximum D
1
, D
3
or D
5
)
– (Minimum D
2
, D
4
or D
6
)
If out of specification, rebore or replace the cyl-
inder, and replace the piston and piston rings
as a set.
2nd step:
Measure the piston skirt diameter “P” with a
micrometer.
a 5.5 mm from from the piston bottom edge.
Piston size P
Standard 56.960 56.975 mm
Oversize 1 0.25 mm
Oversize 2 0.50 mm
If out of specification, replace the piston and
the piston rings as a set.
3rd step:
Calculate the piston-to-cylinder clearance us-
ing the following formula:
Piston-to-cylinder clearance =
Cylinder bore “C” –
Piston skirt diameter “P”
Piston-to-cylinder clearance:
0.025 0.045 mm
If out of specification, rebore or replace the cyl-
inder, and replace the piston and piston rings
as a set.