Re: How long have you ridden your motorized bicycle?
6 years, not counting the two days I used a motor this year (weather is killing me). At least 2000 miles each year. Got 4 full years out of my first motor, a 25cc Homelite from a $10 yard sale leaf blower. Then a year with a free McCulloch string trimmer, just to test motor out. Last year went back to a Homelite when I found another for ten bucks.
So that's twelve thousand miles from motors I bought for $20, and two are still running good.