KTM 125 SX - Manual (Page 30)

ENGLISH
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MAINTENANCE WORK ON CHASSIS AND ENGINE
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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 [1], tilt aside and remove the air
filter [2] and filter support [3] from the filter box.
– Do not clean foam filter with fuel or petroleum since these damage the
foam. KTM recommends the products of the company Motorex for air fil-
ter 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 filter 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.
Place the air filter on the filter support and insert both in the center of the
filter box. Hold in place with the filter retaining clip.
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Exhaust system *
If the end cap [4] can be removed, the silencer is filled with glass-fiber yarn.
Have the filling checked regularly by an authorized KTM workshop (see
Lubrication and Service Chart). The insulating material fibers escape through
the holes in the perforated pipe with time, causing the silencer to “burn out”.
In addition to causing a higher noise-level, it will also affect the power char-
acteristic. The insulating material suitable for your exhaust is available from
your authorized KTM workshop.
To replace the glass-fiber yarn set [5] remove the end cap and pull off the
outer pipe [6]. Tape a new glass-fiber yarn set to the inner tube and slide on
the outer pipe. Mount the end cap.
Make sure the caps are screwed on tightly. Mount the muffler stress-free before
tightening the fixing screws.
The exhaust system becomes very hot while the motorcycle is running. Do not
start work on the exhaust system until it has properly cooled down, to avoid
burns.
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