Stihl MS260 Pro chainsaw carburetor question

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This saw is about seven years old and had moderate use. The first four years I did use 10% ethanol gas. Since then I only use 91 octane 100% gas with added Seafoam in all of my small engines. It's running good again but I did have to bump up the idle so I will keep the leaks you mentioned in mind.
 
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