Stihl has built chainsaws in Waiblingen since Andreas Stihl lodged the first patent in 1926. They stayed privately held, stayed vertically integrated — they still cut their own guide bars and pour their own magnesium cases — and that discipline shows up in every tear-down we do. The engines tend to be forgiving of operator neglect; the plastics, less so. We service MS-series farm saws that have run since the Clinton administration on nothing more than fresh fuel and a new sprocket every decade.
Most American Stihl owners are on an MS 170, MS 250, or MS 391. The smaller saws take a 3/8″ Picco Micro chain (3/8 LP, .050 gauge, typically 56 or 57 drive links). The farm boss moves up to .325″ or 3/8″ standard. Trimmers (FS 55, FS 56) run Stihl’s own AutoCut 25-2 head but take any 0.095″ twist line. Pole pruners and backpack blowers share that same 4-MIX or 2-MIX engine family.
APOROZONA machines direct-fit replacement guide bars in the common 16″ and 18″ 3/8 LP layouts, chain loops in matching pitch/gauge/drive-link counts, trimmer heads compatible with the M10x1 LH spindle on the FS family, and Oregon-profile air filters that beat the OEM by a few months on service life. We do not make replacement piston kits — that’s specialist work — but the wear parts we ship have all been run through a tank of fuel on our own fleet before they get a SKU.
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