Exhaust Bridge Info

The bridge supports the piston and keeps the rings from bulging out into the port on bikes with real wide ones. It's easy to drill the holes. Wiseco includes instructions with their pistons. I assume that OEM pistons come with the holes.

Short version is: install the piston on the connecting rod, slide the cylinder over it, use a pencil to trace both sides of the bridge on the piston. Remove the piston and drill the holes between the lines, where the instructions indicate. Use a drill press if you have one available. Hole size may vary, so follow the instructions.