I have tecate 4 engine in a yamaha blaster. Last time I rode it, it ran good for a little while the started bogging down bad, I had to rev up the motor to keep from dying. After the motor died, i tried to start it and now all it will do is backfire. The stator source coil ohms out good, but the flywheel magnets have pieces broken off of them. Would this cause a timing problem? Please help. I will post pics later.