Malaguti Dune X 125, Service Station Manual

Page: 165 / 272

Dune 125 - Dune X 125 - Euro 4
Engine
ENG - 165
Characteristic
Piston / cylinder
Piston pin hole - standard: 15.003 - 15.008 mm
(0.5907 - 0.5908 in)
Maximum piston / cylinder coupling clearance
after use
- top ring: 0.075 mm (0.0029 in)
- middle ring: 0.065 mm (0.0025 in)
- oil scraper: 0.25 mm (0.0098 in)
Standard piston / cylinder coupling clearance
- top ring: +0.03 / 0.062 mm (0.0012 / 0.0024 in)
- middle ring: +0.02 / 0.052 mm (0.0008 / 0.0020
in)
- oil scraper: +0.01 / 0.19 mm (0.0004 / 0.007480
in)
cylinder check

Using a bore meter, measure the cyl-
inder inside diameter at three different
points according to the directions
shown in the figure.

Check that the coupling surface with
the head is not worn or misshapen.
CAUTION
THE MARKING IS LOCATED ON THE PISTON CROWN.
Characteristic
Maximum run-out allowed:
0.05 mm
C
YLINDER
-
PISTON COUPLING CLEARANCE
125
CM
³
Coupling categories with cast-iron cylinder
NAME ABBREVIA
TION
CYLINDER PISTON FITTING
CLEARANCE
min max min max min max
Cylinder/Piston M 58.010 58.017 57.963 57.970 0.040 0.054
Cylinder/Piston N 58.017 58.024 57.970 57.977 0.040 0.054
Cylinder/Piston O 58.024 58.031 57.977 57.984 0.040 0.054
Cylinder/Piston P 58.031 58.038 57.984 57.991 0.040 0.054