Turns out these pistons are total crap. They were machined wrong. On two of the pistons there is a height difference of .010 from one side of the piston to the other. So these are pretty much scrap. And the guy that used to make them I think may have died. Maybe i can use them as a bigbore on a CB125. Now I have to buy new pistons. $$$$

I want to make a T-shirt out of this. Not a bad Idea right? Do it. Make some. And send me one for giving you the idea.

Modified cb750 pistons i picked up for my build. These have deeper valve pockets machined in them for a higher lift cam and have high performance coatings.

Compared to a stock 550 piston