You probably need a new coil/magneto. Follow the plug wire to it. If it's a magneto you can try a little sand paper to clean off the flywheel magnet and the magneto points of contact. They aren't touching the magneto so you can get some paper in there. If it's a coil, you will need a new one.
.030"
.030"
Rj19l
Spark Plug gap is .025
Champion CJ8 spark plug is for the crsftsman 3.0 edger/trimmer
.030
.03
Spark plug gap should be .025 http://store.chainsawr.com/
.30 gap for craftsman 3.5
0.030"
Rj19lm or j19lm
.030