Superbike roots: The engine is based on the 2005 GSX-R1000 and therefore features a longer stroke than the current GSX-R1000 supersport for greater torque production in the low-to-mid rpm range. This engine has the same 44mm dual-throttle valve (SDTV) throttle bodies as the 2K5 GSX-R and the same ports and valve diameters, although the valves are now stainless steel rather than titanium. Cam profile and timing has been altered to optimize torque output. The gearbox is straight out of the GSX-R but with a standard non-slipper clutch. Final gearing is shorter with two teeth added to the rear sprocket, while engine redline is set at 11,500 rpm (2,000 less than the GSX-R). Claimed peak output is said to be 145 horsepower at 10,000 rpm with 78.2 pound-feet of torque at 9,500 rpm, measured at the rear wheel.