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It sounds like piston hit the head. I have the same sound 2 months ago.
5 days ago i got rebuild my engine.
New gasket, new piston rings, new crank, new rod, engine totaly cleaned and set of ACL. After 50km of riding betwen 1krpm to 2,5k rpn i checked the engine and heared knock over 3krpm.
SR shit.
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