KTM 125 SX 2010, Owner'S Manual

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Servicing the left engine housing half
– Remove all shaft seal rings and use an oven to heat the casing half
to approx. 150°C.
The bearings usually fall out of their seat of their own accord by
knocking the housinq half on a plane piece of wood when the housing
has a temperature of 150° - 180° C. At this housing temperature, the
new (cold) bearings can be inserted in the bearing seats without
pressing.
Crankshaft roller bearing
1
Remove the old roller bearing and press in a new roller bearing up to
the stop. The inner ring on the crankshaft must also be renewed (see
paragraph about crankshaft).
Needle bearing of drive shaft
2
Press the old grooved ball bearing inward, press the new grooved ball
bearing from the inside up to the stop.
Grooved ball bearing of countershaft
3
Press the old ball bearing inwards, press in the new ball bearing to the
stop from inside.
Crankshaft seal ring
4
Press in a new shaft seal ring from the outside until the sealing lip is
flush with the inner surface.
Counter shaft seal ring
5
Press in the new shaft seal ring, until it is flush with machined surface.
Shift shaft seal ring
6
Press in the new shaft seal ring, until it is flush with machined surface.
Needle bushing of shift shaft
7
Remove the shaft seal ring and press the old needle bushing inwards.
Press in the new needle bushing from the outside to the collar
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Grooved ball bearing of shift roller
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Heat the shift drum to approx.150° C.
The grooved ball bearing should fall out of the bearing seat automa-
tically at this temperature.
If necessary, tap the shift drum on a flat wooden surface.
NOTE: Never heat the shift roller with a welding torch or similar device
as you will damage the coating.
Insert a new grooved ball bearing and press it in gently up to the stop.
When the housing half has cooled off, check to see that the bearings
are tight.
– Finally check clear passage of the crankshaft roller bearing lubri-
cation bore
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