MV Agusta 2008 F4 312RR 1078, Workshop Manual

Page: 59 / 124

- 29 -
C
Cylinder kit
Cylinder revision
Check to be sure that enclosures show no sign of sei-
zures with the pistons.
Check piston ovalization in the following way:
A)Measure the nominal diameter of each cylinder at
a distance of 20 mm from the superior edge as
indicated in the figure.
B)Perpendicularly repeat the measurements to the
preceding ones.
C)Verify that the ovalization is inferior to 0,015 mm
(wear limits).
In the case that not even one cylinder should pass this
verification, substitute the entire block, If the block
should be substituted and if necessary also substitute
the pistons and elastic strips. The cylinder is marked
with a letter which indicates the class it belongs to: A
and B cylinders and A and B pistons exist which must
be coupled with the same letter; the cylinder-piston
coupling must be carried out between classes of the
same origin (A cylinder-A piston; B cylinder-B piston).
Piston revision
Carefully clean the piston ceiling from carbon residues.
Continue with a careful visual check of the piston; no
signs of lines or other damage must appear.
Measure the diameter of the piston at the portion indi-
cated in the direction perpendicular to the piston pin
axle.
In the case of excessive wear of one of the pistons,
substitute it. The piston should belong to the same
class of the cylinder selection.