its on the stock bore size with only a fmf fatty pipe and powercore two silencer. It has a 260 main jet in it but i purchased a top end rebuild kit with new piston and rings and everything else i need for a top end rebuild for 105 bucks off ebay. I took the new and old pistons to my dealer and his tech said i can get away with just honing with the new piston because the ring end gap is under 12 thousandths of an inch and wiseco recommends under that for thier pistons.
