I totaly forgot that my camera is on and this is what was cought on 'tape'. Problably sand got into main jet in carburetor and bike lost power on full throtle. This video shows hot to fix it in a minute. Maybe it doesn't work on your bike, but it did here:) Bike is KTM 125 EXC 2012.
But make sure when you get to garage that you take off and clean whole carburator.

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