Viewed from the rear of the flywheel (engine side).Download Procedure pdf
Position piston at TDC. (so woodruff key is on top)An F650 classic is shown but the GS is basically the same.
Be warned it may take considerable effort to crackBMW recommend heating the flywheel to 80c (176f).
BMW recommend heating the flywheel to 120c (248f).The picture shows clutch removed and taped to hold parts together.
Cut tape from sprag clutch and ensure spring is seated.Clean threads of bolts and flywheel then fit clutch to flywheel
Use Loctite 648 on threads and torque to 35nmFit circlip & Oil the freewheel in the freewheel housing
Check lock function and locking direction of freewheelClean crankshaft, woodruff key, flywheel and hex nut.
Slide flywheel onto the crankshaft, align woodruff key and groove.Rotate starter gear counter-clockwise if needed to fit flywheel.
Install the circlip and hex nut. Tighten hex nut. Torque is 180 NmFit side covers, wiring and wiring cover (GS), then refill with oil.