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I had strange noise from the rear of my 250 last month. Here is how the noise was isolated while spinning the rear tire.
1. Remove the brake caliper (noise still there)
2. Remove the swing arm (noise still there)
3. Remove the drive belt (noise still three)
4. Remove the centrifugal clutch (noise gone)
Problem was the ball bearing in the centrifugal clutch was going bad. The roller bearing was still good.
In your case, if removing the clutch you still have the noise only leaves the final drive.
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