Checking The X-Distance; Setting The X-Distance; Installing The Cylinder Head - KTM 50 SX Repair Manual

30/ASSEMBLING THE ENGINE

Checking the X-distance

17.26
Info
The X-distance is the distance defined for the piston protrusion, when the cylinder is clamped down and the piston is at top
dead center.
The X-distance must be checked very carefully. If the X-distance is too large, the compression decreases and the engine loses
power. If the X-distance is too small, the engine knocks and overheats.

Setting the X-distance

17.27
Info
The X-distance is adjusted by inserting cylinder base gaskets of various thicknesses.

Installing the cylinder head

17.28
–
Apply special tool
Adjustment gauge (45129006000) (
–
Position the piston at top dead center.
–
Check the X-distance.
Info
The piston should not raise the gauge off of the cylinder.
300502-10 X-distance (distance from adjusting
gauge to piston)
» If the specified value is not reached:
–
Set the X-distance. (
–
Check the X-distance. (
–
Remove the cylinder. (
–
Replace cylinder base gasket
–
Install the cylinder. (
300503-10
–
Put the O-rings in place.
Info
Ensure that dowels are seated correctly.
300463-10
–
Mount the cylinder head. Mount and tighten screws
Guideline
Screw, cylinder head
Info
Always use new screws and washers.
301064-10
to the cylinder.

p. 146)
0... 0.10 mm (0... 0.0039 in)
p. 92)
p. 92)
p. 69)
with a cylinder base gasket of the required size.

p. 91)
M7
with the washers.

18 Nm
(13.3 lbf ft)
92