KTM 250 EXC RACING Owner's Manual page 117

5-2E
Left casing half
6
3
2
Remove all shaft seal rings and use an oven to heat the casing half to
approx. 150°C.
Cylindrical roller bearing of crankshaft
1
Use a suitable punch to press the cylindrical roller bearing from the
8
outside to the inside. From the inside, press in a new cylindrical roller
bearing up to the stop.
Grooved ball bearing of main shaft
2
Use a suitable punch to press the grooved ball bearing from the outside
1
7
to the inside. From the inside, press in a new grooved ball bearing up to
the stop.
Cylindrical roller bearing of countershaft
3
Use a suitable punch to press the cylindrical roller bearing from the
5
outside to the inside. From the inside, press in a new cylindrical roller
bearing up to the stop.
Shaft seal ring of shift shaft
4
From the outside, press in new shaft seal ring up to a flush position, its
open side facing inward.
Shaft seal ring of countershaft
5
From the outside, press in new shaft seal ring up to a flush position, its
open side facing inward.
4
Grooved ball bearing of balancer shaft
6
Use a bearing extractor to pull the grooved ball bearing out of the casing
half. Press a new grooved ball bearing in up to the stop.
Grooved ball bearing of shift roller
7
8
At a casing temperature of approx. 150°C, the grooved ball bearing will
fall out from the bearing seat almost by itself.
If necessary, knock the casing half lightly on a planar wooden board.
Press a new grooved ball bearing in to a flush position.
Needle bearing of shift shaft
8
Press needle bearing from the outside to the inside.
Press a new needle bearing in from the inside and up to a flush position.
– Once the casing half has cooled down, check the bearings for tight fit.
7