I am in the market for a new piston and cylinder. I am leaning towards a bbk. But what brand and size is most reliable. I race mx and flat track. Reliability is the most important. This is the first time I have had to open it up. It is a 2006 yfz 450 I bought new in dec 05. So I am hoping to get similar life out of the next set. I already bought a hot rods +3 crank. Have web cams, fci intake, stock head getting carb bored. And a full system yoshi pipe.