get an impact driver. Every motorcycle owner should have an impact driver. Oh and a set of e-z outs for when you break the darn things. And a nice comprehensive set of metric bolts, screws, nuts, washers, etc.
If it's truly broken, then yes it would cause no spark. YOu say it indicates "1" on the meter. What is the other possibility? YOu can short the two leads together and see what that reads. That will tell you what a short looks like. And leaving the leads hanging in the air will tell you what a broken wire looks like on the things. Either one is bad for a pickup coil. Oh, you could also read the manual that came with the tester...
hope that part gets you rolling!