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Chain Saw Collectors Vintage chainsaws and other air cooled gas engine saws, collecting and restoring.

Chain Saw Collectors

Stihl FS-81 brush cutter


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  #1  
Old 09-01-2017, 08:02:15 AM
BernieTech BernieTech is offline
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Default Stihl FS-81 brush cutter

Hope this is the right place to post...

Just dug out my weedwacker circa mid 70's. Last used abt 12 years ago. Fuel was run dry at that time. I rinsed out the tank and added fresh 2 cyc mix. I do have spark. When I pulled the plug it is wet w fuel. It will not fire.

Before I tried to start it I pulled the plug and it was dry and in good shape. I did give it a squirt of fogging oil. The wacker is in almost mint condition, was rarely used.

A local Stihl dealer will do a diagnostic for short $ and has a carb cleaning machine. I would like to try getting it going first. To me, it is most likely a carb issue. Has any one used the cheap "ebay" carbs from China?

After this I have two Stihl chain saws of the same age to tackle...

Thanks,

Bernie
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Old 09-01-2017, 10:11:24 AM
gdstew gdstew is offline
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Default Re: Stihl FS-81 brush cutter

If you have spark and gas, it should run. Check the exhaust outlet on the muffler for being plugged up. Also, remove the air filter when trying to start.
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Old 09-01-2017, 10:13:22 AM
Ed Radtke Ed Radtke is offline
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Default Re: Stihl FS-81 brush cutter

check muffler for critters.check muffler screen if equipped with one.
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Old 09-01-2017, 02:05:50 PM
BernieTech BernieTech is offline
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Default Re: Stihl FS-81 brush cutter

me bad...this am I rechecked the sp plug gap, right on the $$$. pulled cord a few times w plug reinstalled, no gas on plug. I guess what I saw on plug was the fogging oil. put a few drops of 2 cyc gas and oil mix in combustion chamber, reinstalled plug. gave a pull and it fired..

My guess, not getting fuel. now the ?, install a "china" carb or take it to the shop for carb service.

What would the "experts" do?

Thanks for the replies so far.

Bernie
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Old 09-02-2017, 03:13:16 AM
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Motormowers Motormowers is offline
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Default Re: Stihl FS-81 brush cutter

I would just go on Ebay and get a new carb for $35.00 with free shipping rather than take it to a shop. It doesnt pay to take the time to tear the old ones down and clean and rebuild. Doesnt matter if its a Stihl boxed carb or aftermarket. They're all made in China now just priced different for the name you pay for.
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Old 09-02-2017, 10:42:39 AM
BernieTech BernieTech is offline
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Default Re: Stihl FS-81 brush cutter

Thanks, good advice, as always from the Smokstak gang...

Bernie
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