Click the link in Gerg's post You can compare the GSA to the GS. Click compare models then click on the left tab at the bottom, "Bike configurator". It looks like the GSA is not changed too much. Air/oil cooled for GSA, Air /liquid cooled for GS. Same single plate dry clutch for GSA, Wet clutch for GS, which looks like it's located in the front of the engine. Those are the two that stood out the most to me.