5-4
Repair manual KTM 250 -F Art.-No. 3.206.052-E
Bypass valve
– Check the valve piston, sealing seat and pressure spring for damage.
Minimum length of the pressure spring
1: 23.5 mm
NOTE: if the length of the pressure spring is less than 23.5 mm, the
opening pressure of the bypass valve will be reduced. This will lead to a
drop in the oil pressure and consequently to increased wear.
Clutch cover
– Pry the shaft seal ring out of the kickstarter shaft 2, press in a new
shaft seal ring (open side on the inside) up to the stop.
– Pry the shaft seal ring
3 out of the water pump.
– Press the grooved ball bearing
4 out of the timing train idler shaft
from the outside to the inside. Press in a new grooved ball bearing
from the inside to the outside up to the stop.
– Press a new shaft seal ring into the water pump (open side on the
outside) until flush.
– Pry the shaft seal ring out of the crankshaft
5, press in a new shaft
seal ring (open side on the inside) up to the stop.
– Blow compressed air through the oil duct
6 and make sure it is not
clogged.
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