can anyone explain how to drill my own piston, the advantages, and does this mod add power??

 

I drilled holes in my Pro-X to allow more lubrication and cooling at my exhaust port I think. Just look at a Wiseco and make identical holes, about 1/8" diameter, 2 or 3 will do. Make sure there are not any sharp spots sticking out from drilling.
ERIC

 

how do you know were to drill the holes

 

What are application piston are you drilling??? If it's a two stroke, with a bridged exhaust, then this is what you to do it to. Assemble the top end without gaskets, leave the head off, and don't install the circlips, just pin the piston(w/o rings) in place and slide the cylinder over.

Take a "Sharpie" permanent marker and now outline each side of the exh. bridge on the piston skirt. When you disassemble, you'll have a nice outline in which then to place your holes in.