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Stihl FS 80 Carb problems

Kubota's Avatar

Join Date: Jun 2008
Posts: 2

06-06-08, 11:08 AM   #1  
Stihl FS 80 Carb problems

I have a FS 80AV Lawn trimmer that I cant keep running. It is an older model. It has a TK carb 2G10N(on the side of the carb) It will only run if I keep pushing the green button on the bottom of the carb. I have cleaned it, put new fuel lines on it, new mixture of gas and oil(amsoil). When I take the bottom cover off (were the green button is) the gas flow valve is shut and when I push the green button it opens the valve that is the only way the engine gets enough gas to run.How do I set the valve to stay open so I can at least get it to idle?
I am going to get a carb kit to see if that helps.
Thanks for any help.

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cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,566

06-06-08, 09:50 PM   #2  
Hopefully someone here with some experience with that carb will chime in soon. I am not familiar with it. I would suspect a carb kit would help, and there's a good chance that pressure fluctuations from the crankcase operate the fuel inlet valve via a diaphragm? If so, a rebuild kit should help there.

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