any metal on metal grinding sound means STOP! put it in the air on stands etc and check your tires for bad bearings, look at your driveline to see if a sprocket or convertor is rubbing on something. look for fresh bare metal, shavings. Not knowing what it looks like, i have noreal clue, but that's the basics. If it has a band brake or calipers, either of those could be dragging or misaligned and making the noise. it could just be something has loosened up from the break-in runs.
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