I was winterizing the z today has 2600 miles on it. First service was done at the dealer at 600 miles. My bike now has 2600 on i change the oil every 2000 on bikes. I started it first thing this morning everything was fine went up to the gas station put stabil in the tank come home let it run a min. shut it off change the oil and filter fill the oil up put 3.9 quarts.started and the oil light is flashing shut it off checked oil level was good. started back up light still flashing and i can hear a knock. wtf! only thing i can think of is the oil pump maybe took a nap.