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Chainsaw

Stihl MS 250

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 The MS 250 superseded the Stihl 025.

What this page covers

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).

Check before searching Amazon

Newer units (SN# 287332321+) use 0000 350 6202

Review annual maintenance parts
Verify before ordering: Fitment can vary by serial number, production date, region, and sub-model. Match the OEM number and physical dimensions before ordering.

Annual Maintenance Parts

These are individual maintenance components already present in this model record. No combined product claim is made.

Ignition

Spark Plug

OEM number
0000 400 7000
Specification / dimensions
0.5mm gap
Evidence status
Medium confidence · Aftermarket catalog · 2026-05-21
Variant / exclusion warning
Verify the removed part number and physical fit before ordering.

Air intake

Air Filter

OEM number
1123 120 1613
Specification / dimensions
Not recorded
Evidence status
Medium confidence · Aftermarket catalog · 2026-05-21
Variant / exclusion warning
Fits 021, 023, 025, MS210, MS230, MS250

Fuel delivery

Fuel Filter

OEM number
0000 350 3500
Specification / dimensions
Not recorded
Evidence status
Low confidence · Aftermarket catalog · 2026-05-21
Variant / exclusion warning
In-tank pickup body fuel filter

Named part number: Not recorded

Search Amazon for Stihl 0000 350 3500

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Primer Bulb

OEM number
4238 350 6201
Specification / dimensions
Not recorded
Evidence status
Medium confidence · Aftermarket catalog · 2026-05-21
Variant / exclusion warning
Newer units (SN# 287332321+) use 0000 350 6202

Fuel Line Kit

OEM number
1123 358 7701
Specification / dimensions
Not recorded
Evidence status
Medium confidence · Aftermarket catalog · 2026-05-21
Variant / exclusion warning
Includes fuel pickup line and return line; fits 021, 023, 025, MS210, MS230, MS250

Stihl MS 250 quick specs

Equipment
Chainsaw · 2-Stroke
Covered Parts
Spark Plug, Air Filter, Fuel Filter, Carburetor, Recoil Starter, Ignition Coil, Primer Bulb, Fuel Line Kit, Chain, Guide Bar
OEM References
0000 400 7000, 1123 120 1613, 0000 350 3500, 1123 120 0600, 1123 080 1802, 1123 400 1201, 4238 350 6201, 1123 358 7701
Model Family
MS 210, MS 230, MS 250, MS 251
Last Reviewed
2026-05-21
Data Confidence
Aftermarket-confirmed
Sources Consulted
  • Stihl MS 250 parts references
  • Aftermarket catalog cross-references
  • Retailer fitment listings
ℹ See also: MS 210, MS 230, MS 251 — verify each model and part independently; family membership does not establish fitment.

Quick Fitment

Part TypeOEM / SpecCommon OptionConfidence
Spark Plug0000 400 7000NGK BPMR7AMedium · 2026-05-21
Air Filter1123 120 1613Stens 605-687Medium · 2026-05-21
Fuel Filter0000 350 3500OEM 0000 350 3500Low · 2026-05-21
Carburetor1123 120 0600Zama C1Q-S112Medium · 2026-05-21
Primer Bulb4238 350 6201Zama BG-00-4Medium · 2026-05-21
Recoil Starter1123 080 1802Stens 150-568Medium · 2026-05-21
Ignition Coil1123 400 1201Stens 610-879Medium · 2026-05-21
Fuel Line Kit1123 358 7701Stens 115-128Medium · 2026-05-21

Maintenance Interval

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.

Before You Buy

  • Confirm the full model is Stihl MS 250, not just the family name.
  • Check serial number, production date, and regional variant before ordering.
  • Match the old OEM number stamped on the removed part when available.
  • Compare dimensions, plug gap, thread, fuel line diameter, or chain pitch/gauge where applicable.

Common Mistakes

  • Ordering from a family listing without checking the exact sub-model.
  • Buying a kit that includes the headline part but wrong gaskets, lines, or bulb size.
  • Choosing the wrong carburetor revision when multiple versions were used.
  • Assuming all fuel line kits use the same diameter and routing.
  • Installing the correct plug number with the wrong gap.
  • Matching bar length but missing pitch, gauge, or drive-link count.

Symptoms Map

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

Replacement Options

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.

FAQ

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.

Related Repair Guides

How to Read Stihl Model and Serial LabelsA model-identification guide for Stihl saws and trimmers, focused on avoiding wrong-family parts and serial-range mistakes.

Spark Plug

OEM0000 400 7000Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Dimensions
0.5mm gap
Variant notes
Verify the removed part number and physical fit before ordering.
BrandPart #Identity
NGKBPMR7ANot classified
View this exact listing on AmazonAmazonAffiliate link

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ChampionRCJ6YNot classified
View this exact listing on AmazonAmazonAffiliate link

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Air Filter

OEM1123 120 1613Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
Fits 021, 023, 025, MS210, MS230, MS250
BrandPart #Identity
Stens605-687Not classified
Search Amazon for Stens 605-687AmazonAffiliate link

As an Amazon Associate, WhichPartFits may earn from qualifying purchases. Match the OEM number, dimensions, and model variant before buying.

Fuel Filter

OEM0000 350 3500Confidence: Low · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
In-tank pickup body fuel filter
BrandPart #Identity
No named part listing is published for this part yet. Use the OEM reference and verify with a dealer or service manual before ordering.

Carburetor

OEM1123 120 0600Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
Zama C1Q-S112; fits MS 210, MS 230, MS 250
BrandPart #Identity
ZamaC1Q-S112Not classified
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Recoil Starter

OEM1123 080 1802Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
Fits MS 210, MS 230, MS 250
BrandPart #Identity
Stens150-568Not classified
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Ignition Coil

OEM1123 400 1201Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
Fits MS 210, MS 230, MS 250
BrandPart #Identity
Stens610-879Not classified
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Primer Bulb

OEM4238 350 6201Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
Newer units (SN# 287332321+) use 0000 350 6202
BrandPart #Identity
ZamaBG-00-4Not classified
Search Amazon for Zama BG-00-4AmazonAffiliate link

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HipaG002-HNot classified
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Fuel Line Kit

OEM1123 358 7701Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
Includes fuel pickup line and return line; fits 021, 023, 025, MS210, MS230, MS250
BrandPart #Identity
Stens115-128Not classified
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Chain

OEMSpec-based fitmentConfidence: Low · Source: Inferred
Reviewed
2026-05-21
Dimensions
18 inch, .325 inch pitch, .063 inch gauge, 68 drive links
Variant notes
Stock bar length; verify drive link count matches your bar
BrandPart #Identity
Oregon22LPX068GNot classified
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Guide Bar

OEMSpec-based fitmentConfidence: Low · Source: Inferred
Reviewed
2026-05-21
Dimensions
18 inch, .325 inch pitch, .063 inch gauge
Variant notes
Spec-based fitment; confirm dimensions on the existing bar or part.
BrandPart #Identity
Oregon183PXLBA074Not classified
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