 The first mass-produced F4 1000, the F4 1000 S, was released in 2005 and came with the same 166 bhp engine of the AGO model.Compared to the previous 750 cc models, the 1000 S was fitted with 50 mm Marzocchi front upside-down fork and Sachs rear shock absorber with hydraulic control of spring pre-load.The screen had been re-profiled and adjustable footrests fitted.