Checking The X-Distance; Adjusting The X-Distance - KTM Freeride 250 R EU Repair Manual

18 30/ENGINE

18.5.18 Checking the X-distance

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.

18.5.19 Adjusting the X-distance

Info
The X-distance is adjusted by inserting cylinder base gaskets of various thicknesses.
–
Position the piston ring.
The anti-rotation lock engages in piston ring end
202775-10
–
Slide the cylinder over the piston.
–
Push the cylinder down carefully.
–
Mount nuts
Guideline
Nut, cylinder base
202776-10
–
Apply special tool
Adjustment gauge (54829001100) (
–
Position the piston at top dead center.
–
Check the X-distance using the special tool.
Feeler gauge (59029041100) (
X (upper edge of piston to upper edge
of cylinder)
202777-10
» If the specified value is not reached:
–
Adjust the X-distance. (
Preparatory work
–
Check the X-distance. (
on both sides and tighten in a crisscross pattern.
3
to the cylinder.
1
p. 209)
p. 141)
p. 141)
.
2
M10 35 Nm
(25.8 lbf ft)
p. 207)
0... 0.10 mm (0... 0.0039 in)
141