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best bet ....replace the coil. it comes w/ the wire. BUT iiif it came off the spark plug cap end ,,, you might be able to screw it back in, but make sure it is clean tight fit :O
Remove plug and lay plug base against the cylinder or jumper plug base with jumper wire or battery jumper cables to the cylinder and pull starter cord and see if you have spark on plug, you may have to darken room as some sparks are very hard to see in light. If you have no spark would check the ignition switch by removing wire and make sure the wire does not touch metal. If you still have no spark you probably have bad coil that is if this is not a point type ignition system in which case it could be dirty or pitted points. Would always help if you give model no. When asking questions which we could look up type of machine.
possibly on/off switch-has it gotten wet? Also check where wiring from on/off switch meets the wiring from the weedeater body.Check those connectors/crimps make sure theyre plugged in /right fit and not wet.Make sure youre ground wire is grounded/attatched/screwed to the machine.Ive had a weedeater get wet twice at the on/off switch and had to bring it in the A.C. overnight to really dry out.It worked.Hope this helps.If none of this does then its maybe the coil(semi-internal-no fun) or the fat wire carrying the spark from the plug to the body(semi-internal-no fun).Good luck!
does it even run at all for a short bit? If not pull the spark plug from the unit, place some part of the spark plug threads on the metal surround the spark plug hole in the engine, turn the unti manually with the pull cord/starter and see if you get spark, if no spark it could be the Ign. coil module, a bad spark plug wire, or a break in the wiring to the ign. coil module.
take the spark plug out and pull the engine over with the spark plug in the wire and ground the plug to the trimmer and see if it sparks. if not flip the switch the other way and see if it sparks then you shall know.
Put a spark tester on it see if you have spark,if not.its your coil,would probably be cheaper to buy blower at yard sale than buy a coil. If tou do have spark order a rebuild kit for your carb.When you take the carb off and clean it,look real close,there will be a number on the carb,you need that number to order the right kit,all carbs on weedeater brand equip. are like that.
If you still don't have a spark with the new plug, then you may have a kill switch wire grounding the motor, keeping it from starting. If it's not that, then you have a bad ignition module (coil).
Stihl weedeater was running and stopped suddenly. Put in a new fuel filter and cleaner air filter with soap and water. Checked spark plug and it appeared fine. Started the weedeater, ran for a second or so and stopped. Spark plug wasn't gas fouled. Could it be the carburetor needing new diaphram gasket and spring.
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