While you wait for answers, we may have found some information which could help you.
Click here for Set High SpeedMy weed eater wont stay running?
what is proper sparkgap for weedeater?
Sears Model 316-791880 Gas Trimmer?
fuel line installation?
How can I fix my Sears 25cc line trimmer?
spark plug gap for craftman line trimmer model 358791030?