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3.11 THERMAL UNIT
Before assembling the thermal unit, thorough
checks must be carried out on the cylinder, pis-
ton, pin bolt, elastic bands described hereafter.
3.11.1 Checking piston and
elastic bands
Eliminate carbonaceous sediment from the top
of the piston and wash the entire piston with
specific degreasing agent.
Do not use sharp points or tools for cleaning.
Then carry out a careful analysis of the piston
which must be free from forcing, scratches,
cracks or any type of damage.
Analyse the external diameter of the piston.
The diameter must be measured at a distance
X
from the inner edge of the skirt, perpendicularly
to the axis of the pin bolt.
Refer to the following table for the piston's se-
lection classes.
Quota at which to measure the outside diameter of the
piston.
x
Displacement
[cm³]
Quota x [mm]
Bore [mm]
A
B
c
300
18
71,935÷71,945
71,945÷71,955
71,955÷71,965
In order to check the state of use of the elastic
bands, the band must be inserted in the cylinder
so that its axis is aligned with the axis of the cyl-
inder. Then measure the distance between the
two opposite edges.
The elastic bands must be positioned at about
31 mm from the cylinder's upper edge.
The respective service limits are carried in the
table below.
First check of elastic bands.
Displacement
[cm³]
Service limit of elastic band
[mm]
300
0.4
Summary of Contents for X Trainer 300 2T 2015
Page 1: ...CODE 036440030 000...
Page 19: ...2 17 Engine disassembly Remove the four collar nuts 9 9 Extract the cylinder and base gaskets...
Page 116: ...114 NOTES...
Page 117: ......
