My last one lasted for over 8000 miles,currernt one has about 1500 on it.I ride daily around 15-20 miles or so.Except for break-in,im WOT every time I ride.Had to change the magneto on the first on,so far so good on my current one.I just recently started on build 14.Pulan Synthetic from Wal-mart at 32:1.