KTM XC-W 250 SX - Manual (Page 41)

ENGLISH
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MAINTENANCE WORK ON CHASSIS AND ENGINE
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Refilling/Bleeding the cooling system
The cooling system must be bled as described below after draining the
cooling liquid or after adding more than 0.25 l (0.06 US gallons) cooling liq-
uid.
Make sure that the drain screw [1] is fastened.
Pour approx. 0.5 litres (0.13 US gallons) coolant into the system.
Remove screw [2] at the cylinder head. Reinstall it as soon as the cooling liq-
uid emerges free of air bubbles (only for 125/200 engines).
Remove the screw [3] on the right radiator.
Now add cooling liquid until it emerges free of bubbles at the right radiator.
Then immediately mount the screw so that no more air can enter the right
radiator.
Top up the left radiator until the coolant can be seen approx. 10 mm
(0.4 in) above the radiator fins.
Check the coolant level again after a short ride.
Cleaning the air filter *
The air filter must be cleaned prior to each race or whenever dust has accu-
mulated. To clean, lift the filter box cover
(see illustration) and pull off towards the front.
Detach the bottom of the filter retaining bracket [4], tilt aside and remove
the throttle cap [5] and the air filter [6] and filter support [7] from the filter
box. The SX models do not have a throttle cap.
– DO NOT CLEAN FOAM FILTER WITH FUEL OR PETROLEUM SINCE THESE DAM-
AGE THE FOAM. KTM RECOMMENDS THE PRODUCTS OF THE COMPANY
MOTOREX FOR AIR FILTER MAINTENANCE (BIO DIRT REMOVER AND LIQUID
BIO POWER).
– NEVER START YOUR MOTORCYCLE WITHOUT ANY AIR FILTERS. OTHERWISE,
DUST AND DIRT MAY PENETRATE AND CAUSE DAMAGE AND INCREASED WEAR.
– DUST AND DIRT CAN ACCUMULATE AND DAMAGE THE ENGINE IF THE AIR FIL-
TER IS NOT MOUNTED CORRECTLY.
Thoroughly wash the air filter in special cleaning fluid (Motorex Bio Dirt
Remover) and allow it to dry well. Only press out the filter, do not wring it out
under any circumstances. Oil the dry air filter with a high-grade filter oil (Motorex
liquid Bio Power). Also clean the air filter box. Check the carburetor collar for
damage and that it is filled correctly.
Mount the air filter on the filter support. Insert the air filter and filter support
in the throttle cap and mount them in the filter box, aligning in a central posi-
tion, and fix with the filter retaining bracket.
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