Removal of the front sprocket
Undo the screws (14) and remove the sprocket cover (13).
Slacken the chain
Engage a low gear and unscrew the two screws (10) on the sprocket retaining plate (11).
Remove the plate (11) from the gearbox output shaft.
Slide the front sprocket (12) with the chain (9) off the gearbox output shaft and then unhook the chain from the sprocket.
Screws (10) are torqued to 10 Nm with Loctite 222.