Join Date: Nov 2004
Location: Titusville, FL.
I've got JE pistons that are 13.5:1 but not at stock bore. Pistons seem to be doing good. Just be very careful to double check your ring gaps before you put the pistons back in. I have heard of problems with that in the past. Also be sure to put the rings on the right way (they have a top and bottom). Its hard to tell the difference in sides but there is a slight difference just to give you a warning.
"Besides, my ZX-10R eats GSX-Rs for breakfast." -- SportRider Magazine Article