So just bought my first big frame 3 wheeler today, an '84 200es. Overall it seems mechanically good except an oil leak, and a blown coil. So when it came from the previous owner it wasn't running which my friend who picked it up diagnosed as a blown (chinese knockoff) coil and/or plug so he replaced both (another chinese coil). Ran fine after that but when I got there to pick it up it blew that coil when I was testing it out. Is this common with the chinese coils or should I be checking something else? Maybe the voltage regulator or spark plug? I do have a used 200m coil on the way cause I know the knockoff ones are crap