Yeah! I have a KLX110 that I've been racing, but man! It likes to break! Part of the reason that I want a KX65 pit bike is because I just have to do something with the rear shock, and drop in some fork springs-- then ride it!
My 110 is a ball, but I have 15 different vendors that I have to call to get parts for it when I break something, and I always find a new problem with it. I like to go right to my local dealer to get parts that will likely be in stock, just toss a piston and rings in it every now and again and call it a day.
On the other hand-- my other KLX is a close to stock bike. That bike is a ball, it just has springs and damping rods up front, and a Works shock out back. It has other things like long bolts in the peg mounts, a 4th gear shift drum, rim lock in the rear, tires, bars, tapered steering bearings, etc... That bike never breaks-- I can thrash that bike, and it just keeps purring right along. The problem with it is that it's damn slow. I would get smashed lining up and racing on it.
I guess I have no problem with a 4 stroke 110 type of bike, but it's crazy money to build and maintain one. The tracks that we race on have big jumps too-- that stocker I have would be pressed to get over most of them. So why not ride a bike like the KX65 that's intended to do what we need it to do? Especially when the whole build will cost alot less than the stocker I described above? When I go to small backyard type tracks-- the stocker is great, but the tracks that we're racing on demand more bike and motor. --L*64