Echo SRM 1501 trimmer has minimal fire. Feels very slight, will not fire thru plug

If this is a solid state ignition ( black box mounted right next to the fly wheel)check for rust on fly wheel and coil/ignition.Sand with light grit sand paper if nessesary. Make sure to reistall with the same gap between the two parts.note the gap at this point could also be wrong.Also check to see if the clip inside the boot where the spark plug conects is not bent and that it is conecting properly. If this is a points ignition system then its basicaly the same steps.Clean contact pionts check plug boot for good contact. Or could be bad coil.Be sure you are using a plug with the propor heat range.