2005 gsxr 600 what does the f1 mean?

The "F1" in "GSXR 600 F1" stands for "Factory 1." It was a special model of the GSXR 600 that was produced in limited quantities for the 2005 model year. F1 refers to the fact that the bike was built with more advanced components and technology than the standard GSXR 600, making it a higher-performance model. The F1 model featured upgrades such as a stiffer chassis, improved suspension components, and a more aggressive riding position, making it better suited for track riding and racing compared to the standard GSXR 600.