Will a 06 gsxr 750 motor fit on a 03 gsxr 1000 frame?

No, a 2006 GSX-R750 motor will not fit into a 2003 GSX-R1000 frame without significant modifications. The two models have different frame designs, engine mount points, and overall dimensions. Additionally, the electrical systems and components may not be compatible, requiring further adjustments to integrate the motor properly. It's advisable to consider these factors before attempting such a swap.