
57
ASSEMBLY
betamotor.com
4.14.2.3 Cylinder
Fit the M6x12 bolt (1) for draining the cooling wa-
ter, with the corresponding washer 6x12x1.
Tighten the bolt to 8 Nm.
Insert the piston into the cylinder from below, po-
sitioning it in the correct direction (with the arrow
pointing in the bike’s direction of travel). Lubricate
the contact surfaces well, and take care not to dam-
age the piston rings. Next, insert the circlip for re-
taining the piston pin, on one side only. Make sure
that the open part of the circlip is facing either up-
wards or downwards.
Slide the cylinder down between the studs until the
small end of the conrod is aligned with the piston
pin housing. Then insert the piston pin from the side
which is still open, and lock it with its circlip, having
previously lubricated the surfaces of the piston pin
itself and of its housing.
N.B. Ensure that the cylinder base gasket is in posi-
tion before fitting the cylinder.
N.B. Ensure that both circlips are fitted with the open-
ing facing either upwards or downwards.
Bring the cylinder down until it makes contact with
the crankcase, if necessary with the help of a rub-
ber hammer to settle it in position. Ensure that the
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