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Crf 150r Strange rattle from engine

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Hello guys, a strange question from Denmark.

We got a crf 150r in the family.

The thing is that it got this strange rattle from the engine. It sounds metalic.

It is worst and loud in the high rmp's, i almost cant hear it in idle.

It sounds like a loose metalic rattle.

It runs perfectly, it just have this loud annoying sound.

We have taken it apart 2 times, and replaced everything!

New Piston, crank, camshaft, clutch, chain, All bearings in the engine.

Pleas help, we are out of ideas.

Best regards from Denmark,

Mike Hansen

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