Checking The Cylinder; Checking The Piston - APRILIA DORSODURO 1200 ABS - ATC Service Station Manual

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DORSODURO 1200 ABS - ATC

Checking the cylinder

•
All seal surfaces must be clean and flat.
•
Make sure all threads are in proper conditions.
•
Check cylinder sliding surface for signs of friction and scratches. Also check the seal sur-
faces for damages.
CAUTION
IF THE GROOVES ON THE CYLINDER LINER ARE EVIDENT, REPLACE THE CYLINDER AND
THE PISTON.
•
Clean off lime scales on the cylinder
cooling slots.
•
Measure the cylinder bore at a dis-
tance of 10 - 43 - 90 mm (0.39 - 1.69 -
3.54 in) from the head coupling sur-
face; the highest value should be
considered to estimate wear limits.
Cylinder bore (C): 106.000 mm (4.1732 in) C=
D1 or D2 max
Replace the cylinder, the piston and the piston ring
all together if not complying with specifications.

Checking the piston

•
Measure the piston skirt diameter "P"
with a micrometer (a=10 mm (0.39 in)
from the piston lower border).
•
Calculate the clearance between pis-
ton and cylinder as follows:
Piston diameter (P): 106.000 mm (4.1732 in)
Piston - cylinder clearance C = C - P
Piston - cylinder clearance: 0.085 mm (0.00335
in)
•
Replace the cylinder, the piston and
the piston ring all together if not com-
plying with specifications.
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Engine
ENG - 265