Why would a bike blow out coolant?

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Joined
Jun 24, 2012
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Location
Slowveld
Bike
KTM 890 Adventure R Rally
Why would a bike constantly blow out coolant from overflow?

Am I correct in assuming it is either faulty radiator cap or pressure from engine getting into cooling system via leaking gasket ?

Bike has lost 2/3 of coolant from reservior in 1600km. All blown from overflow pipe.

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