A 45.7 cc mid-duty saw that overlaps with the Stihl MS 250. Pros call it the 445 e-series because of the second-gen version’s auto-tune carburetor, which re-learns fuel mixture every time you start it. Good for high-altitude crews; a nightmare to diagnose when it sulks.
The auto-tune carb on the 445 II occasionally loses its mapping after a bad fuel run — Husqvarna dealers can re-flash it, but we generally recommend a manual carb swap if you’re mechanically inclined. The brake handle assembly wears where the hand guard pivots; replace as a unit.
Chain sharpening: every tank when bucking. Fuel filter: annually. Carb diaphragm kit: every 3 years or when starting becomes fussy. Bar groove cleaning: every 5 tanks.
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