KTM 450 XCR-W USA User Manual

30/ENGINE - WORK ON INDIVIDUAL PARTS 81
400376-10
ಥ Check the sealing area of the cylinder head for distortion using a straight edge and
the special tool.
Feeler gauge (59029041000) ( P. 179)
Cylinder/cylinder head - sealing area
distortion
싨0.1mm (싨0.0039in)
» If the measured value does not equal the specified value:
ಥ Change the cylinder.
Checking/measuring the piston
200160-10
ಥ Check the piston bearing surface for damage.
» If the piston bearing surface is damaged:
ಥ Change the piston and, if necessary, the cylinder.
ಥ Check that the piston rings can move easily in the piston ring grooves.
» If the piston ring is stiff:
ಥ Clean the piston ring groove.
Tip
Use an old piston ring to clean the piston ring groove.
ಥ Check the piston rings for damage.
» If the piston ring is damaged:
ಥ Change the piston ring.
Info
Mount the piston ring with the marking facing upward.
ಥ Check the piston pin for discoloration or signs of wear.
» If the piston pin has strong discoloration/signs of wear:
ಥ Change the piston pin.
ಥ Insert the piston pin into the connecting rod and check the bearing for play.
» If the piston pin bearing has too much play:
ಥ Change the connecting rod and the piston pin.
200161-10
ಥ Measure the piston at the piston skirt, at right-angles to the piston pin.
Specification
Piston - diameter
Size I 94.93… 94.96mm (3.74… 3.74in)
Size II 94.95… 94.97mm (3.74… 3.74in)
Info
Piston size is marked on the piston head.
Checking the piston ring end gap
200163-10
ಥ Remove the piston ring from the piston.
ಥ Place the piston ring in the cylinder and align it with the piston.
Specification
Under the upper edge of the cylinder 10mm (0.39in)
ಥ Measure the end gap with e feeler gauge
.
Specification
Piston ring end gap
Compression ring 싨1mm (싨0.04in)
Oil scraper ring 싨1.2mm (싨0.05in)
» If the end gap is more than the specified value:
ಥ Check/measure the cylinder. ( P. 80)
» If the cylinder wear is within the tolerance range:
ಥ Change the piston ring.
ಥ Mount the piston ring with the marking facing toward the piston head.

KTM 450 XCR-W USA Specifications

General

Brand	KTM
Model	450 XCR-W USA
Category	Motorcycle
Language	English