DR650 Exhaust question

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Matie spero

Race Dog
Joined
Sep 17, 2012
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Location
Pretoria
Bike
AJS (all models)
Ok this has been troubling me for a while now, it seems like my header pipe start to rust, but its more of a mud burnt onto the pipe.

it all seems to start from the top of the pipe and runs down the inside, most DR fotos posted I see the same thing happening.

what can cause this? leakage past the exhaust gasket???

 

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