KTM 85 SX 2004, Repair Manual, Page: 44 / 89

5-5
Checking cylinder for wear
– To check the wear on the cylinder, measure the cylinder 20 mm
below the upper edge of the running surface using a micrometer.
– Measure the cylinder diameter in the X and the Y axis to detect any
ovality.
Engine Cylinder Ø Piston size
85 47.000 - 47.012 1
47.013 - 47.025 2
Recoated cylinder
Note: If the cylinder diameter is greater than 47.025 mm, the Nikasil
cylinder must be reconditioned or replaced. For reconditioning of the old
cylinder all exhaust control components must be removed. The
intermediate flange
1 remains with the cylinder. The piston size is
stamped into the bottom of the piston.
Nikasil coating of cylinder
Nikasil is the brand name for a cylinder coating process, developed by
the piston manufacturer Mahle. The name is derived from the two
materials used in this process - a nickel layer into which the particularly
hard silicon carbide is inbedded.
The main advantages of the Nikasil coating are:
●
excellent heat dissipation and thus better power output
●
low wear
●
low weight of the cylinder.
NOTE: The worn coating can be regenerated at low cost provided that
the cylinders running surface is flawless.
1
x
y
20mm