Hello I am new here so please be easy I am working on my daughters's 84 kz550 ltd the number two plug not firing any thing to look for other then a bad coil

 

Welcome to the forum. Is the plug not sparking, or is the cylinder not firing but the plug has good, strong spark (and do you know how to check this)? Are the plug and wires in good condition with solid connections? If the plug has good spark, but the cylinder not firing, does the cylinder have compression and is it getting fuel?

 

Welcome to the site, IDRIDR sounds like he's gotcha.