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Se lection 01
pistons
diameter
·
V
35
model
CLASS
A
CLASS
a
65.968
+
65.974
mm
65.974
..;.
65.980 mm
(2.597
+
2.5973")
(2.5973
+
2.5975")
Selection 01
piston
diameter
- V
50
model
CLA
SS
A
CLASS 8
73.968 ... 73.974 mm
73.974
+
73.980
mm
(2.911
9
...
2.9121
"
)
(2.9121
+
2.91
23"
)
Pistons
must
always be matched
with
cy
lind ers
01
same class.
Matching
data
-
Gudgeon
pin-piston
hole clearance (Dwg
l
ig. 46)
0
/
001
P""'
Pi61e
n
hel
.
d
••
.
14.994
...
15.000 mm
15.003
+
14.997
mm
(.5902
~
.5005')
(.5905
+
.5903"
)
Gudgeon
pin
seJ
eclion
(fi9.
46
)
C<ASS
COLOUR
2
white
1
blaclt
Pislon
hole selection (fig
.
46)
CLASS
COLOUR
2
whi
l
e
1
c
Re-fittlng
To
re-assemble piston
,,0,.
with pin
..
E"
on small
end
..
G", heat
up the piston in
oil
to
a
temperature
01
about
6O'
e (14()"'F)
in order to
all
ow
the piston
to
e x-
pand sufficiently for
the pin to be
pushed in
(See
fig.
42).
5.7
- a
SEPARATING
THE CRANKCASE COVERS
•
Drain the
oil
and rem
aile the sump complete with
filters and
oil pressure
9auge.
Then
:
-
undo nuts
..
A"
and
~B,.
in
fig.
47.
USing
a
plastic
mallet,
lap bol1om
crankcase haIr
..
A
..
lightly
10
tree
it
from
the studs fitted
on
the
top half
..
B
..
(See
fig. 48).
black
CLASS
C
65.980 -;- 65.986 mm
(2.5975 ..;. 2.5978")
CLASS C
73.980 -;- 73.986
mm
(2.9123
-;- 2.9125")
Nagall"
e
a llowance
and
inle
.
le
,
ence iii
e
n
ass
.
y
F
rom
a clearance
of
0.009
mm
(.00035")
10
an
interference
fil
o
f
0.003
mm
(.0001
18»)
DIAM ETER
15.000
-;-
14.997
mm
(.5905
+
.5903")
14 .997
..;..
14.994
mm
(.5903 -;-
.5902"
)
DIA
METER
15.003
..;..
15.000
mm
(.5906
+
.5905")
15.000..;.. 14.997
mm
(.5905
..;..
.5903")
33
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