Yamaha DT125RE 2005, Руководство по обслуживанию

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ENG
INSPECTION AND REPAIR
5-19
Standard Limit
Cylinder
Bore “C”
56.00 ~ 56.02 mm
(2.204 ~ 2.205 in)
Taper “T” — 0.05 mm
(0.001968 in)
Out of — 0.01 mm
round “R” (0.00039 in)
C = maximum of D
1
~ D
2
T = maximum of D
1
or D
2
- maximum of
D
5
or D
6
R = maximum of D
1
, D
3
or D
5
- minimum of
D
2
, D
4
or D
6
b. If out of specification, rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
c. Measure piston skirt diameter “P” with the
micrometer.
Piston size “P”
Standard
56.34 ~ 56.40 mm
(2.218 ~ 2.220 in)
Oversize 56.65 mm (2.23 in)
Oversize 56.90 mm (2.24 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”
f. If out of specification, rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
EAS00264
CHECKING THE PISTON RINGS
1. Measure:
• piston ring side clearance
Out of specification a Replace the pis-
ton and piston rings as a set.
Micrometer
90890 - 03008
Piston-to-cylinder clearance
0.045 ~ 0.050 mm (0.0018 ~
0.0020 in)
Limit: 0.1 mm (0.004 in)