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That long run of your belt on the bottom off that video looks like it’s a little sloppy and flapping around. Is it slapping against something down there? You may need more tension. These belts stretch more than you’d believe under high rpm and load. Go see some videos of that on YouTube. Kind of amazing how far they can balloon out. My guess is that your belt is contacting something under high rpm/load and stretch and it’s shredding it up.
I put a JRE Supertensioner on mine and it’s a nice piece.
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