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Tool Talk Discussion Forum

String trimmer with no power

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Charlie M

12-25-2007 10:15:52




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I have a Homelite string trimmer that suddenly has no power. It doesn't even go up to full RPM's when the trottle is opened - just seems to labor. I would fix it if it was something I could fix. I don't mind spending money on some parts but its not worth it to take to a dealer. Not sure where to start. Any ideas - could it be just a plugged up carburator. Anyway to know if it could be an ignition problem. I've had the trimmer for several years. Is there anywhere on the Web to get a parts diagram or order parts?

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Bill46

12-26-2007 09:50:11




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 Re: String trimmer with no power in reply to Charlie M, 12-25-2007 10:15:52  
I get small engines thrown at me all the time. They won't run and folks go and buy new ones.
Came home one day after being away for awhile and had 6 lawn mowers in the drive where folks just went and got new ones.
Most of the time its the air filter or the pulg.
Folks just forget to chean the air filter...or don't care.
Usally with a trimmer this time of year its bad fule.
My 2 cents.

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2x4

12-25-2007 20:43:27




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 Re: String trimmer with no power in reply to Charlie M, 12-25-2007 10:15:52  
Take the muffler completely off, then run the machine. If this makes a difference, you have your culprit. 90% of all small engine problems are solved by a new spark plug. If there's still a problem, its fuel related - lines, filter, carb, intake manifold gasket, etc.



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RobMD

12-25-2007 17:08:37




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 Re: String trimmer with no power in reply to Charlie M, 12-25-2007 10:15:52  
get rid of the spark arrester on the muffler.



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JT

12-25-2007 16:36:34




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 Re: String trimmer with no power in reply to Charlie M, 12-25-2007 10:15:52  
Charlie, more than likely it is the muffler or exhaust port is plugged.



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glennster

12-25-2007 15:59:24




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 Re: String trimmer with no power in reply to Charlie M, 12-25-2007 10:15:52  
if the exhaust isnt plugged, see if there are two mixture screws on the carb. if so turn each one in gently and count the number of turns. then back em all the way out and shoot some carb cleaner in each hole. put the screws back in, and reset them to where they were originally. prolly 1-1/2 turns out. start er back up, then adjust the screws till it runs the best. one is low speed , the other is the high speed mix.

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CRUSADER

12-25-2007 12:54:54




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 Re: String trimmer with no power in reply to Charlie M, 12-25-2007 10:15:52  
I agree, most likely the exhaust is carboned up and it's not letting it run right. I recently had problems with a Weed Eater brand string trimmer that was quite a few years old, and during a visual inspection found that the fuel (return line) lines were old, deteriated and cracked causing it to get more air than fuel. The engine would run, but not get any power or high rev's.



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Charlie M

12-25-2007 13:05:58




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 Re: String trimmer with no power in reply to CRUSADER, 12-25-2007 12:54:54  
I work on the old Farmalls all the time but would never had had this idea on a small engine. Thanks for the ideas.



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tomIN

12-25-2007 10:37:52




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 Re: String trimmer with no power in reply to Charlie M, 12-25-2007 10:15:52  
My best guess is that the exhaust is plugged up with carbon. Try removing the muffler. There often is a piece of screen wire behind it that acts as a spark arrestor that gets covered over with carbon. Clean all the carbon off everything you can see.

If it isn't the exhaust, the next best guess is the carburator (or air filter, if there is one.)



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