Checking The Cylinder - APRILIA RS4 50 2011 Workshop Manual

RS4 50 MY2011

Checking the cylinder

- Measure the openings of the piston elastic seal-
ing rings by placing a feeler gauge in the cylinder
Characteristic
Maximum allowable piston ring opening:
0.35 mm (0.0138 in)
- Check cylinder for wear with a bore meter.
- Carry out measurements following the perpen-
dicular axis and at three different heights of the
cylinder.
- To select the piston to be coupled to the cylinder,
refer to the TYPES tables, keeping in mind that the
piston-cylinder clearance should be always be-
tween 0.035 mm (0.00138 in) and 0.045 mm
(0.00178 in).
Characteristic
Serviceability limit:
0.05 mm
Specification
Nominal cylinder diameter (A)
Cylinder diameter (A)
Piston nominal diameter (A)
Piston diameter (A)
Specification
Nominal cylinder diameter (B)
Cylinder diameter (B)
Piston nominal diameter (B)
Piston diameter (B)
Specification
Nominal cylinder diameter (C)
Piston diameter (C)
Piston nominal diameter (C)
Cylinder diameter (C)
TYPE A
39.890 mm (1.57047 in)
39.8875 - 39.8925 mm (1.570369 - 1.570566 in)
39.840 mm (1.568499 in)
39.8375 - 39.8425 mm (1.568401 - 1.568598 in)
TYPE B
39.895 mm (1.57066 in)
39.8925 - 39.8975 mm (1.570566 - 1.570763 in)
39.845 mm (1.56869 in)
39.8425 - 39.8475 mm (1.568598 - 1.568794 in)
CLASS C
39.900 mm (1.57861 in)
39.8475 - 39.8525 mm (1.568794 - 1.5568991 in)
39.850 mm (1.56889 in)
39.8975 - 39.9025 mm (1.570763 - 1.57096 in)
Desc./Quantity
Desc./Quantity
Desc./Quantity
ENG - 119
Engine