I can tell you for a FACT, the Werks P3 and the Ofna Picco are identical, in every way. Crank case, pitson, sleeve, crank, carb, you name it. I have them both.
They are "for real"..... you won't have to screw with your radio, or put one in a buggy to know they make power. They make awesome low end, and midrange power. The most I have ever seen. They need BIG CLUTCH BELLS, and ALUMINUM clutch shoes though.... With plenty of weight in the clutch shoes.
Just break them in GENTLY. It will take almost a gallon of fuel to get them broke in propperly, but its worth it.