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Sounds like the carburetor is needing cleaning and rebuilding. Once rebuilt then the fuel mixture needs resetting if the carburetor has these adjustments.
The diaphragms harden over time and the internal filter clogs. The internal filter screen that both Walbro and Zama using now tends to clogs rather easily but the replacement version in the kits doesn't.
Unless you really know what you're doing i wouldn't advice it be carried out by a novice. Carbs contain small one way valves that can get damaged. Avoid using airlines to clean and blow out carbs as these can damage the valves. Diaohrams, gaskets and needles are pretty straight forward tho.
I don't have a diagram or the part numbers to the minor and major repair kits, but a Stihl dealer should be able to help. Tell him you need a kit for a ZAMA C1Q type carb. The exploded view should be with the kit.
The FS 85 was produced in HUGE quantities over a number of years. Several different carbs were used during production and Stihl has several proprietary carbs in use. You will need a Rebuild Kit (NOT just a Diaphragm Kit) for this particular carb. On the carb body you should see a Series and a Model identification.
Example: If this is a ZAMA carburetor, the C1U-S66 might have been used on your trimmer.
Get that info off the carb body and ...
For ZAMA carb lookups click HERE.
For WALBRO carbs click HERE.
I have seen 2 different carburetors used on this unit. A Walbro and a Zama. You will need to get the information off the carb. (Walbro WYC-10 or Zama K39A) are the two I have seen, but you need to be sure what yours is. Then purchase the correct O/H kit and rebuild it.
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