Hey, i'm new to dirt rider, Just bought a 1981 honda xr80 for $75 from a kid that knew nothing about bikes and i know just a bit. last summer it ran fine then he tried to start it and it wouldn't run. i thought it would be a gummed up carb, but i went to see it and it had no spark. so i bought it and took of the cover covering the magneto. i tried to take off the drum thing with the magnets with a steering wheel puller but its on so tight it broke a bolt. i took a screw driver and pulled a couple of obliterated magnets through the hole so now i know why it dosen't run. how can i take off the drum thing with the magnets on it? Thanks