Designed to be used with aftermarket high-performance pistons. The standard bore on a Predator 212cc engine is 2.756". The Wiseco Piston #11132p94 is for a 2.756" bore, which means it will yield approximately .003" piston to wall clearance. This is right where you want to be, so provided your bore is good and needs nothing more than a fresh cross-hatch honing, it will be good. If your bore is larger, out-of-round, or the engine has already been run for a while with the stock piston, you will need to go with a larger piston.