I have a 25 cc Craftsman Weed Eater. When I prime the bulb and fire up a trimmer it starts and will only stay running if I have my finger on the throttle. If I relieve pressure on throttle, the weed eater dies and I cannot start it again for several hours. If I leave the throttle wide open, it will run forever. Any help would be appreciated.

SOURCE: Weed eater GTI 17 won't run on high speed

A couple of things may work...
Make sure you have the correct Oil / Fuel mixture, if it is incorrect the motor may have problems running.
Also take off the bottom where the cord is wound up, make sure there hasn't been any grass get wound up inside it, this will cause it to stall out on high RPM.

Jim Parker

• 1041 Answers
• Posted on Jul 02, 2009

SOURCE: Weed eater won't run

Sounds like you may just have a dirty carburetor.

Youwill need to disassemble the carburetor and spray with carb.cleaner.Make sure the small screen is free of debris. (Should be able to seedaylight through it.)

Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152),to clean the small portals in carb. These portals can become blocked. Reassemble and start.

If the carb. parts are more than 4 years old, you may have to replace them.

If you need further assistance, just let me know.

Jim

SOURCE: sthil weed eater will not run when hot?

you will need to replace you muffler so the machine can get rid of it's exhaust

SOURCE: i have a 31 cc ryobi weed eater start for about

I think a new carburetor kit and a good carburetor tune up is in order my friend. Sounds like it's starving for gas. If it bogs down after warm up when you throttle it, then yes it needs a carb tuning. The L screw is the low side screw and should be turned in lightly until it seats then back it out one and quarter turns (1 1/4). The H screw is your high speed screw. Also, turn it in lightly until it seats, then back it out approximately a 3/4 turn. With these settings the unit should start and may even stay running. Again, if it bogs when throttled, while running turn the L screw out a little more maybe only 1/16th of a turn and then try it again. If it does rev then you'll have to adjust the H screw in about a 1/16th of a turn. But make sure you only do this after the engine has warmed up.

Hope this works, good luck
Skidooer

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SOURCE: I have weed eater model FX26SC it starts and when ...

Either the clutch is worn out or the flexible drive shaft is broken. Either repair is likely to cost almost as much as a new unit.