2004 BMW GS650 DAKAR SUMP COMPRESION PROBLEM

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PHILIPKUHN

Race Dog
Joined
Nov 15, 2012
Messages
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Location
KATHU NOORD KAAP
Bike
KTM 950 Adventure
One of my Friends has a GS650 with sump-compression. After 400km's the breather blows oil into the air box, destroying the filter.
The bike has 40 000km's on the clock, the exhaust is burning clean (there is no signs of piston or ring problems).

What can the problem be?
Please help.
 
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