These guys mean well, but someone without any testing equipment , can not do testing of coil and wires/plug with those instructions, unless you have a meter and know how to attach probes. Simply put, unscrew spark plug, put plug back in plug boot. Pull over the starter rope, with spark plug grounded , either on top of motor(metal) . Then try to observe the Blue spark at tip of plug. If it is to bright out, you can also put a small screwdriver (small enough to put to sparkplug electrode) and crank it over while holding the screwdriver. If you get a bit of shock from it, you know it is putting out . May not be the best spark, or it could be just enough to ignite the gas. Then you know the carb is not supplying any or enough gas , and will need carb cleaning with carb spray, or rebuilding, and possibly a new carb. Observe coil and see if the magnets have turned a shade of blue. That means they have lost their magnetic charge, and will have to change out the coil.
Try a new spark plug that one may be bad
Testimonial: "still no fire thru the wireor plug"
SOURCE: stihl fs 45 ignition problem no spark
Disconnect the small spade terminal wires from the coil itself and test for spark. If you do not have spark replace coil. If you do have spark check those small wires for insulation damage and grounding. If wires are OK check kill switch.
NOTE: DO NOT START MACHINE with small wires unplugged! Only test for spark.
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