Well, from my own personal experience, they have two main flaws that put me off of them. First one being lack of oiling to the wrist pin. When I took my 200s engine apart after a month because of it smoking (will get to this later) the wrist pin was completely stuck in the piston, so apparently piston got so hot in the wrist pin journal that it deformed, because I tried putting another pin in the piston and it still wouldn't go in. My second reason is because with the same riding style/break in that I did when I had put a 200x piston in my 200s (which I had in it for 6 months before I broke the engines crankshaft and the valves slammed into the piston) the engine never smoked with the 200x piston and after 2 weeks with the wiseco, low comp and smoking. Maybe I just have bad luck with wisecos, but next time I build a 185/200 engine for high performance it will have a xr200 or helm and son piston
1985 ATC125M: Parts
1985 ATC200S: 84 200S Bottem end, 200x Head, 200x Carb, S&S Cycle Exhaust, Wiseco 10.25:1 Piston, Reground Cam with About 1mm more lift(unknown specs).
1988 TRX250X
1983 ATC200E: Total Pile.
"Bout Tree Fiddy" Master of Thy 22RE