Troubleshooting a Stihl 025 Chainsaw - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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Old 05-30-2010, 07:43 PM   post #1 of 8
jskirwin
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Default Troubleshooting a Stihl 025 Chainsaw

About 8 years ago I bought this Stihl (model 311y) new. It didn't get much use over the years, mainly because I had difficulty starting it. About 6 years ago I had it in the shop for maintenance but haven't really used it in about 3 years.

When I pulled it out a few days ago there was no gasoline in it. I fueled it up, added chain oil, and tried to start it. On the first pull I got a few putt-putts to my surprise, but after that, nothing no matter what I did - pulling it on choke, low choke, no choke, nothing.

So I changed the plug to an E3 with the funky anode (cathode?) and on the first pull got a few putt-putts again. Then nothing. I put a few squirts of gas into the cylinder - nothing. Then I pulled the spark plug, grounded it to the engine, and pulled.

I got a nice 2 feet of flame out of the hole thanks to the spark from the plug and the gas vapor (glad the Wife didn't see that) that caught the air filter on fire. Quickly blew everything out and replaced the plug - but got nothing.

So where do I go from here?

Thanks!
Surry County NC
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Old 05-30-2010, 09:45 PM   post #2 of 8
rscurtis
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Default Re: Troubleshooting a Stihl 025 Chainsaw

Check the compression. Hold the saw by the starter handle. If it falls quickly, compression is probably low. Add a little oil to the cylinder and see if this gets you started.
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Old 05-31-2010, 07:03 AM   post #3 of 8
gray wolf
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Default Re: Troubleshooting a Stihl 025 Chainsaw

sounds like you might be over choking it.try choke once take choke off,
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Old 05-31-2010, 07:13 AM   post #4 of 8
Ironmower
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Default Re: Troubleshooting a Stihl 025 Chainsaw

There's alot of possibilitys. but, if you put gas in the cyl., it likley flooded it. .After that did you try it again?

I'd be willin to bet it's a carb problem.
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Old 05-31-2010, 09:44 PM   post #5 of 8
jskirwin
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Default Re: Troubleshooting a Stihl 025 Chainsaw

Ok... After letting the saw sit overnight I choked it once and it started on the second pull. It put out some pretty strong black smoke and had a very rough idle. When I released the throttle to put the hand guard up, it died. After a few pulls it started again and I ran the chain for about a minute. I released the throttle again to see if it would idle, but it died. This time I couldn't restart it at all.

Bad fuel mixture?
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Old 06-04-2010, 11:18 PM   post #6 of 8
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Default Re: Troubleshooting a Stihl 025 Chainsaw

remove the muffler and inspected the cylinder. if scorring on the piston is present. i have not found any miracle putty to repair scorring. this is the first thing i do on any 2 cycle
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Old 06-04-2010, 11:37 PM   post #7 of 8
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Default Re: Troubleshooting a Stihl 025 Chainsaw

Make sure the fuel lines are not hard and brittle.
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Old 06-05-2010, 05:47 AM   post #8 of 8
Ironmower
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Default Re: Troubleshooting a Stihl 025 Chainsaw

How old is your gas mix? Have you messed with the mixture screws any?

I'm still thinking carb problem.

After re-reading the OP, and you said it has always bin hard starting. It leaves me to believe it was never properly tuned, to begin with. I don't know your capabilities, but you might wanta take it back to the dealer, and let them go over it.

If it was mine, I'd remove the limiter caps on the mixture screws, and adjust. Sounds like it's running to "fat". try turning the "L" screw in some. A 1/4 of a turn, can make the difference.
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