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3.5 CLOSING THE ENGINE
CRANKCASE
Apply a thin layer of grease on all oil seals.
Warm up the crankshaft bearing on the left crank-
case half.
Positioning of crankcase coupling screws.
Screw number
Screw size
Threadlocker
application
Tightening torque
[Nm]
Threading
diameter
Threading length
8
M6
40
NO
10
9
M6
50
NO
10
Proceed with tightening according to the order in
the figure.
Attention: screw “X” must be tightened later in
conjunction with the assembly of the cylinder
(Par.3.13.7).
Cut the extra piece of gasket between the two
crankcase halves in the area of the cylinder and
reed valve seat.
At the end of the operation, use a rubber mal-
let to position the crankshaft by striking both the
right and left half shafts until the shaft rotates
freely.
WARNING!
Take care not to burn the oil seal.
To avoid this, protect it with paper or metal buffer
with an outer diameter of 24mm.
Press the left crankcase half towards the right,
making sure that the shafts and pins on the crank-
cases fit into the respective housings and that the
crankcase half is not offset.
By heating the bearing it will be possible to man-
ually move close to the right crankcase half.
Put the clamping screws in place based on length,
as pictured.
The table below contains indications for applying
the screws.
Crankcase half tightening order.
x
9
7
5
10
11
4
6
8
3
1
2
