Steve H.
Completely unplug the mag from the wiring harness, then wiggle the wire at the blower housing to make sure it's not pinched.
Crank it over and check for spark and/or try to start it with the mag unplugged.......if you have spark or it runs you have a kill circuit wiring issue, if it doesn't, you have a mag issue. If it starts, just choke it to death......
The mag will work acceptably at any reasonable gap setting, if you're in the spec, you'll make a spark.
Mags HATE having voltage applied to the kill wire. Check for 12v on the kill wire from the engine harness....if you have 12V, you have an issue, and you may have killed the mag, requiring $75 and pulling the motor.
Big thing to remember is that mags work on the "no voltage to run, ground to kill" principle.......it should NEVER see 12V EVER, and be grounded to kill the spark.
Once you unplug the mag from the harness it will become very clear where the problem lies....best of luck trouble shooting.