KTM 250 EXC RACING - Manual (Page 43)

ENGLISH
42
Replacing the glassfiber yarn packing of the silencer *
Aluminum silencers are filled with glassfiber yarn to muffle noise. The effect
of heat causes the glassfiber yarn to become loose. This may lead to a loss
of performance and reduce the silencer's muffling power. By experience,
the front glassfiber yarn packing
1 needs to be replaced more often than
the rear silencing mat 2 .
For this purpose, remove the silencer from the vehicle and dismount the
front cap
3 . Pull the front glassfiber yarn packing together with the inner
exhaust pipe 4 out of the silencer. Clean the front inner exhaust pipe.
To facilitate the mounting procedure, you can make a mounting tool 5 out
of wood, plastic, or metal. Insert the mounting tool into the inner pipe and
mount the glassfiber packing. Push the inner pipe containing the packing
into the silencer such that the slot engages the web
A . Use a blunt ended
object to stuff the glassfiber yarn packing all the way into the
silencer, and mount the front cap.
To change the rear silencing mat, start by removing the front packing and
the inner exhaust pipe. Then, drill open the rivets and remove the end cap.
NOTE!
In every exhaust repair procedure, the O-rings must be replaced by new
ones. Glass fiber yarn packings are available from your licensed KTM
mechanic.
ƽ WARNING ƽ
T HE EXHAUST SYSTEM BECOMES VERY HOT WHILE THE MOTORCYCLE IS RUNNING . TO
AVOID BURNS DO NOT START WORK ON THE EXHAUST SYSTEM UNTIL IT HAS PROPERLY
COOLED DOWN
.
Cleaning the spark arrester (MXC/EXC USA) *
The spark arrester should be cleaned every time the glassfiber yarn filling is
changed or at least once annually.
For this purpose, dismount the silencer cap and remove any deposits that
might exist in region
B . Renew the O-ring and mount the silencer cap.
SX
EXC
C
A
B
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450 SX
C
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