The MS 170 is the homeowner saw Stihl built after the 017 — same 30.1 cc bore, same 1.3 kW output, slightly trimmed weight, a thinner bar, and decompression done through a cam rather than a valve. It’s aimed at bucking small firewood and pruning; anything north of six-inch hardwood and it’s working hard.
In order: the primer bulb cracks (service every other season), the fuel line hardens and sucks air (same interval), the clutch drum sprocket wears before the chain does if you run it dry, and the plastic throttle linkage gets crispy after UV exposure. Bar and chain wear is predictable — a 16″ 3/8 LP chain should give you a full cord of oak before needing a sharpen.
Clean the air filter every refuel on dusty days. Check bar oil flow after every tank. Pull the spark plug annually and check the gap at 0.020″. The clutch drum bearing needs grease once a season if you run it hard.
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