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My '83 is belt drive and I have never broke a belt. I'm only on my second belt and I replaced it at around the 25-30000 mile mark, I forget, because I was nervous. I don't hole shot, pop wheelies or other stressers to the belt. I baby my bike as a rule.
I have broken two belts on my 05 1200C. The first happened at 5,000 miles. I was at a light, let out the clutch (slowly, not a rabbit start) and just sat there. The break had an S shape. There wasn't any missing area. The fibers on one part of the break had long threads like it was pulled apart. The other part of the thread was clean, like a cut.
The second break occured at 55,000 miles. This was straight across. I backed out of the garage. Let the clutch out slowly, and just sat there. This break was straight across. I ask the indy to look for signs of alignment, or damage to the sproket. They could find nothing.
Well mine is not a sporty, but the drive belt snapped the same as if it was, but totally my fault. I was trying to show my stupidity and burn the back tire and instead the belt gave.
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