looks like the spring steel device was retro-fitted, you can tell because on the opposite side it has all the correct pieces for the correct killswitch.
Might be a silly question, but have you changed the sparkplug?
Also the spark plug lead, is it shorting out anywhere?
How exactly are you testing for a spark? The easiest way is to hold the end of the spark plug on the metal and pull, you should be able to see a spark, and get a nice little shock in the process
