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noise in engine

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I own a 02 yz250f. i bought used from guy that never rode it. the guy is a freind of mine. performed cam mod before ever riding it. have ridden approx 30-40 hrs sense.bike has alot of power and torque but top end is noisy/rattly on decel and high rpms. noise could be normal not sure. checked valve clearances during mod and where fine. My question is are most or all 4 strokes

noisy in the valve train area? Is that noise normal

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could be piston slap but these bikes are noisy in general. The cam cover does little to deaden the sound.

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Never heard of a cam mod for a YZ250F, For the WR's there are but not the yz's, what exactly did he do? Did he advance or retard the timing on the cam?

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