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Garden Tractors Discussion Forum

Stihl Trimmer

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ACSam

02-04-2005 18:42:58




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I Have a stihl 075 trimmer that quit running suddenly. Just as if you had shut it off. Can't get it to run. Symptoms are: cranks good. Good compression(forces my thumb off the spark plug hole) Had spark(replaced coil anyway) Have even better spark. New Bosch plug. Cleaned carb. Fresh fuel mix. I have fuel, compression, and good spark. I've even shot a little carb cleaner straight into carb. Nothing. After trying to start, the plug is wet. This one has me stumped. Any help or suggestions appreciated.

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lee

02-06-2005 10:38:46




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 Re: Stihl Trimmer in reply to ACSam, 02-04-2005 18:42:58  
what were the conditions when this quit running? Had you been running it hard? Did it run out of fuel? Were you running old fuel? Have you always run good fresh fuel and proper mix? Have you run this out of fuel before? Is the carb mixture set correctly so as not to run lean? One thing to watch is to not let these engines run out of fuel and always use a proper fresh fuel mix. Do not lean the carb mixture out. These engines get quite hot when running. They lean in and out when running low on fuel. They get too hot. You have likely scored the cylinder so compression is too low.

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CARL GREY

02-05-2005 20:35:14




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 Re: Stihl Trimmer in reply to ACSam, 02-04-2005 18:42:58  
COMPRESSION IS NEEDED TO RUN BUT IT ALSO NEEDS SUCTION TO DRAW THE FUEL, TAKE OFF MUFFLER AND CARB AND SHINE LIGHT IN THE CYLINDER, IF YOU HHAVE A SRATCHED CYLINDER SHE WILL NOT DRAW FUEL THE MUFFLER USEALLY WILL PLUG GRADUALLY AND UNIT WILL RUN BUT REAL SLUGGISH, GOOD LUCK



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JT

02-07-2005 07:04:37




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 Re: Stihl Trimmer in reply to CARL GREY, 02-05-2005 20:35:14  
That is why that is the first thing we do. I pull rope, can tell instantly if exhuast plugged from sound of unit. Then check compression. A lot of times an engine will not be scored, and still not have enough sompression to run, plus pulling a plug, check compression is a lot faster and easier than undressing all the covers to get to the muffler.



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Pa. Don

02-06-2005 04:10:19




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 Re: Stihl Trimmer in reply to CARL GREY, 02-05-2005 20:35:14  
That's the first thing I check for when one doesn't start and run. I pull the muffler off and check the cylinder and piston for scratches. One day my dad had a customer bring in his string trimmer to be checked out because he couldn't get it started. Dad took it out back and gave a couple of pulls to see if it would start or not. I came along and as I walked by, I advised him to clean out the wasp nest in the muffler outlet and then it probably would start right up which it did on the first pull.

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teej

02-05-2005 09:51:42




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 Re: Stihl Trimmer in reply to ACSam, 02-04-2005 18:42:58  
The muffler has a screen on it to prevent sparks from escaping the muffler. That screen will plug up with carbon after awhile. remove and clean it, or replace it. Its possible for the exhaust port to plug up on some trimmers also, so you might want to remove the muffler itslef while you're at it and check the port.

mud wasps and other insects like to make a nest/home in the muffler port also, and plug it up. The engine will not blow out that restriction, it just won't run.

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RB/CT

02-05-2005 08:06:57




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 Re: Stihl Trimmer in reply to ACSam, 02-04-2005 18:42:58  
If there is a fuel filter in the gas tank, I would check that. The small rubber fuel line attached to these has a tendency to close up and many times the hose and filter need replacing. Use other excellent info and good luck. Stihl makes a good machine.



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MAC,IL

02-05-2005 07:39:56




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 Re: Stihl Trimmer in reply to ACSam, 02-04-2005 18:42:58  
I had a smaller trimmer by stihl that quit me. I lost all my hair, I finally removed the plugged up screen in the muffler.



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JT

02-05-2005 06:07:13




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 Re: Stihl Trimmer in reply to ACSam, 02-04-2005 18:42:58  
Check your compression, with a gauge, a 2 cycle engine needs a minimum of 90# compression. lower than 70# will not even have enough to fire the engine. even 30# compression will pop your finger off the plug hole. As Greg suggested, look at flywheel, had a saw do this the other day.
water in fuel. No matter what yo do if it has water in the fuel, will not start.
Replace plug, Bosch used to have good plugs, do not have good luck with them anymore.
One of these should get you in the right direction

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Greg C.

02-04-2005 23:04:36




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 Re: Stihl Trimmer in reply to ACSam, 02-04-2005 18:42:58  
Sheared flywheel key might be your problem. I would check it and go from there.



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ACsam

02-06-2005 16:53:29




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 Re: Stihl Trimmer in reply to Greg C., 02-04-2005 23:04:36  
Thanks to all for the suggestions. I bought a compression tester. Only had 80lbs. As per sugestion I checked cylinder wall. It is scratched really bad. Had already removed carbon from muffler, cleaned screen on muffler, replaced fuel filter in tank. Looks like it's going to the junk. Probably cost more to repair than replace. Thanks again to all.



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