At least 2. This one had about 15 maybe 20 hours. They call what I ride in sand but it is actually mine tailings from the old lead mine. Heavy, heavy stuff. Ity was wet today. Tuning to the edge is condition based. Reminds me of tuning a built Banshee daily. The motor is suppose to make peak power at 7800 so I will slow it down with weight and spring. And no, what I want is to get it right fabr. I don't care how, one of these times I have to get lucky and go in the right direction, and not too far. All I did was drag race this morning. I think the set up that is in it is good for runing around but not even close for drag racing. On the line I am revd to 3500 and engagement is 4200, it jumps to 7800 and pulls great through mid at about 60-65 mph it hits the chip at 8400. GPS said 73.4 mph top speed for the day. That is in 500feet. So o-73.4 in 500feet. Lesson learnd-- hard as hell on belts. The tough part is figuring out which one of the variables is the true problem.