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Tool Talk Discussion Forum

Stihl chainsaw wont start

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DougMac in Indi

10-20-2004 05:59:44




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I have an 034 Stihl chainsaw that is giving me fits when starting. If it has sat for a day or more, the only way I can get it to start is to remove the spark plug and pour a little gas mix into it. It then starts and runs fine, and will start OK that cutting session after shutting it off. Any ideas? Thanks in advance.




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phil25

10-22-2004 16:55:31




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 Re: Stihl chainsaw wont start in reply to DougMac in Indiana, 10-20-2004 05:59:44  
Lots of good info, and another 2 cents worth. Take a good look and maybe change it anyway[$2 bucksapprox] The fuel line will wear a hole in just as it enter the fuel tank. A good indication is if the saw it "stopped" and held on it side. Gas runs out of the overflow/carb etc. This hole allows air to enter the tank and fuel to leak out, also a cause of hard starting until the vacumn can suck up the fuel to carb.
hope it helps.

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Hermit

10-21-2004 18:17:48




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 Re: Stihl chainsaw wont start in reply to DougMac in Indiana, 10-20-2004 05:59:44  
The symptoms you describe can also be caused by a worn piston/cylinder. By pouring some mixture in the cylinder, a seal is made at the rings allowing the engine to start. These problem engines probably can be started but using full choke and pulling the cord about 20 times, again when there is enough fuel in the cylinder to provide a seal. Once the engine is started and warmed up, thermal expansion provide a seal until the engine cools down completely.

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JT

10-22-2004 07:08:49




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 Re: Stihl chainsaw wont start in reply to Hermit, 10-21-2004 18:17:48  
Good point, check the compression, it should have 90# minumum to run correctly.



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john2

10-21-2004 08:20:27




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 Re: Stihl chainsaw wont start in reply to DougMac in Indiana, 10-20-2004 05:59:44  
sounds like your choke is not working, sometimes the choke control shaft can rattle itself loose, so that the choke valve does not move when you move the choke lever. turn the black nob on the top and remove the upper case. if it is a likage problem, you should be able to tell with the cover off.



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Teej

10-20-2004 11:12:43




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 Re: Stihl chainsaw wont start in reply to DougMac in Indiana, 10-20-2004 05:59:44  
Sounds like it loses its prime and pumping ability when it sits so long.

Check the fuel lines and replace any that are collapsed, spongy, or very stiff.

Also, consider a rebuild kit for the carb. The pump diaphragm, and such inside could be worn or damaged from age. There is also a fuel filter inside the carb fuel inlet. Its a small, very fine screen.



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Van in AR

10-20-2004 10:52:48




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 Re: Stihl chainsaw wont start in reply to DougMac in Indiana, 10-20-2004 05:59:44  
Check the pulse line to the crankcase from the carb.
Check the fuel line for a pinhole, even inside the tank.
Check the diaphram in the carb for a hole or streching.
If compression is good its probably one of the above items.
Van



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JT

10-20-2004 09:44:29




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 Re: Stihl chainsaw wont start in reply to DougMac in Indiana, 10-20-2004 05:59:44  
You might have a little pin hole in your fuel line. You also might want to check your pulse line from crankcase to carb.



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Mark / Ca

10-20-2004 07:40:58




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 Re: Stihl chainsaw wont start in reply to DougMac in Indiana, 10-20-2004 05:59:44  
I have never had a Stihl saw give me any problems, however I have had similar problems with other small 2-stroke engines. My fix has always been a new plug. Good luck.



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stihltech

10-21-2004 05:43:19




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 Re: Stihl chainsaw wont start in reply to Mark / Ca, 10-20-2004 07:40:58  
All very good suggestions. Do the tune up first. Check the choke and fast idle. This saw will not hardly start if the choke does not close, and it is very prone to a no close condition. The wire to the shutter can be bent slighty for more closing. The saw must also have a fast idle. If it doesn"t, look for a tab broken off the control lever.

How do I know this? Repaired an 036 with the same problem last night. Now starts 2 pulls cold.

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