The factory belt that came on mine lasted like 700 miles when it blew up, got a highlifter 3gx (dayco Xtx) and ran it couple hundred miles and it came unraveled due to a bur on my primary I sanded it down and put the 3gx back on now it has 1000 miles on it and I've had it wet a time or 2.
I have 9000 miles on my original belt on my 550. I use high and low by the book and I have never slipped a belt. They will last a long time if you use high and low the correct way. The belt is about the only thing that has not bad on my XP.
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