piston.

Balancing is getting all similar components and forces to the same weight.

One piston cannot be balanced as there are no others for comparison.

AS for lightening, you could tie a helium ballon to the piston!:D:D:D
 
Lol. I was curious because i ran across a sight and in there machining section they have balancing and lightening pistons.. although i have shaved the skirt off of a piston in one of my kitty cat motors..
Piston Mods
 
Dave Moore isn't even in business anymore.Funny how his site is still up.lol Sounds like he is just opening up the windows on the piston to match the cylinder,etc. Although it may or may not help you get every little bit outof it,it is more of a drag race only application and will for sure weaken the piston.