Chainsaw
2-Stroke · Also known as: 025
The Stihl MS 250 is a 45.4cc 2-stroke chainsaw and the top model in Stihl's homeowner trio alongside the MS 210 and MS 230. It handles 16" to 18" guide bars and excels at regular firewood production and clearing of medium-diameter trees. The MS 250 shares its Zama C1Q-S112 carburetor with the MS 210 and MS 230 — one rebuild kit covers all three. A documented quirk: primer bulbs on units below serial number 287332321 use OEM 4238 350 6201; later units use OEM 0000 350 6202. The MS 250 superseded the Stihl 025.
This page covers the Stihl MS 250 2-Stroke chainsaw.
Recorded annual maintenance parts: Spark Plug, Air Filter, Fuel Filter, Primer Bulb, Fuel Line Kit.
Reviewed spark-plug result: NGK BPMR7A or Champion RCJ6Y; 0.5mm gap.
Evidence: explicit provenance is recorded (Aftermarket-confirmed; reviewed 2026-05-21).
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Newer units (SN# 287332321+) use 0000 350 6202
These are individual maintenance components already present in this model record. No combined product claim is made.
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Inspect filters and fuel lines each season, replace spark plugs during annual service, and service carb/fuel-system parts when starting or idle symptoms appear.
Won't start
Spark plug, fuel filter, primer bulb, carburetor
Starts then dies
Fuel filter, fuel line kit, carburetor
Bogs under throttle
Air filter, carburetor, spark plug gap
Primer will not fill
Primer bulb, fuel line routing, in-tank filter
Cuts slowly
Chain pitch/gauge, bar wear, drive links
Best OEM equivalent
Start with OEM references 0000 400 7000, 1123 120 1613, 0000 350 3500, 1123 120 0600 and match the removed part before choosing a listing.
Named part options
Cross-check named parts such as NGK BPMR7A (spark plug), Stens 605-687 (air filter), Zama C1Q-S112 (carburetor) against the OEM number, identity label, and dimensions.
Best chain/bar combo
Match chain specs together, especially pitch, gauge, drive links, and bar mount details.
Does this fit MS 210 or MS 230? MS 210, MS 230, MS 251 are listed in the same model family. That relationship does not establish interchangeable parts; verify each OEM number, serial range, and physical detail separately.
How do I avoid ordering the wrong carburetor for the MS 250? Match the carburetor number stamped on the removed unit, then compare linkage, choke setup, primer routing, gasket stack, and fuel-inlet direction.
What chain details matter besides bar length? Match pitch, gauge, and drive-link count against the bar stamp, old chain, and drive sprocket. Bar length alone is not enough.
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