Try this link. It has the carby settings on page 26 & 27 of the Stihl FS 45 manual.
http://www.mccoyslawn.com/parts-manuals/Stihl/FS45_46_Manual.pdf
My 'painful' experience of a Zama C1M carburetor on my Stihl SH86 leaf blower is the fact that the fuel filter in the tank is far too efficient. It looks like a normal nylon gauze filter but there is another "felt" filter inside; this second filter is easily blocked (even by too much oil in the fuel mix) causing weak running and poor starting. My advice is to remove this second filter!!
Before I found the root of my problem - I took the airline to the carb - DON'T!!! The white flange under the fuel primer bubble contains a minute fuel non-return valve and the airline completely destroyed the fuel pick-up. This is Stihl Part No 4241 120 2200 and it cost me £24.
All OK now....but thanks for running these 'HELP' web sites. **** H
I neeed an assembly diagram for a Stihl FS90R Model Weed Eater
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