I have a 103 motor and I love it. It has gobs of power and still gets 45 mpg with two up and loaded with gear. I have almost 20,000 miles and upgraded at about 8000 miles. So 12,000 hard miles and no concerns. I haven't measured the crank run-out but if Glider says there may be a problem, well then, maybe there is. I haven't seen it or talked to anyone that had a problem.:57: