2009 BMW F650GS Engine Problems

“I was traveling on interstate 95 south in maryland near columbia doing approximately 65 MPH and had to slow for traffic ahead. I slowed to 50 MPH and disengaged the clutch to shift gears and the engine stalled. I was not initially aware that it had stalled due to the general traffic noise. When I engaged the clutch in the lower gear my rear tire skidded and I almost lost control of the bike. Then I realized the engine had stalled. I was able to roll start the bike by shifting to yet a lower gear and engaging the clutch rapidly but the engine stalled almost immediately again. …”

“Engine stopped (but did not seize) and vehicle started rapid deceleration. The loss of power was instantaneous, but approximately 1 minute earlier the instrument display had gone blank. There were no prior indications of trouble. When power loss occurred, I pulled in the clutch and coasted to a stop at the side of the road. Subsequently testing showed that battery was discharged and loss of power was due to failure of charging system, specifically, failure of generator stator (generator in this vehicle uses permanent magnet rotor and wound stator).”