Chainsaw

Stihl MS 170

2-Stroke · Also known as: 017

The Stihl MS 170 is a 30.1cc 2-stroke chainsaw and the entry point to Stihl's consumer chainsaw range, designed for light homeowner tasks such as limbing, storm cleanup, and occasional small firewood. It accepts 12" to 14" guide bars. The MS 170 runs a Zama C1Q-series carburetor and is mechanically related to the MS 180, sharing several common maintenance parts. Routine maintenance items are the air filter, fuel lines, and primer bulb. Ethanol-blend fuels cause accelerated diaphragm wear; draining fuel before storage prevents the most common no-start condition.

See a wrong fitment? Report a correction.

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

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, 1130 124 0800, 0000 350 3500, 1130 120 0603, 1130 080 2103, 1130 400 1302, 4238 350 6201, 1130 358 7701
Model Family: MS 170, MS 180
Last Reviewed: 2026-05-20
Data Confidence: Aftermarket-confirmed
Sources Consulted: Stihl MS 170 parts references, Aftermarket catalog cross-references, Retailer fitment listings

ℹ See also: MS 180 — parts are often interchangeable within this family.

Quick Fitment

Part Type	OEM / Spec	Common Option	Confidence
Spark Plug	0000 400 7000	NGK BPMR7A	Medium · 2026-05-20
Air Filter	1130 124 0800	Stens 605-325	Medium · 2026-05-20
Fuel Filter	0000 350 3500	OEM 0000 350 3500	Low · 2026-05-20
Carburetor	1130 120 0603	Zama C1Q-S257	Medium · 2026-05-20
Primer Bulb	4238 350 6201	Zama BG-00-4	Low · 2026-05-20
Recoil Starter	1130 080 2103	Stens 150-220	Medium · 2026-05-20
Ignition Coil	1130 400 1302	Stens 610-875	Medium · 2026-05-20
Fuel Line Kit	1130 358 7701	Stens 115-128	Medium · 2026-05-20

Tune-Up Kit

Common service bundle: spark plug, air filter, fuel filter, carburetor, primer bulb, fuel line kit.

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 170, 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, 1130 124 0800, 0000 350 3500, 1130 120 0603 and match the removed part before choosing a listing.

Common aftermarket option

Cross-check aftermarket listings such as NGK BPMR7A (spark plug), Stens 605-325 (air filter), Zama C1Q-S257 (carburetor) against the OEM number and dimensions.

Best for annual tune-up

Bundle spark plug, air filter, fuel filter when servicing the Stihl MS 170 at the start of the season.

Best if replacing fuel system

Compare the fuel filter, carburetor, primer bulb, fuel line kit together so line routing, bulb size, filter style, and carburetor connections match.

Best chain/bar combo

Match chain specs together, especially pitch, gauge, drive links, and bar mount details.

Best budget kit

Use kit listings only when every included part matches this model page; cheap kits often mix correct headline parts with wrong bulbs, lines, or gaskets.

FAQ

Does this fit MS 180? Parts may interchange with MS 180, but verify the serial range, OEM number, and physical part details before ordering.

Should I buy OEM or aftermarket parts for the Stihl MS 170? Use OEM when the part controls fuel metering, ignition, or safety. Aftermarket kits can be useful for routine filters, bulbs, plugs, and tune-up bundles when the OEM number and dimensions match.

How do I avoid ordering the wrong carburetor for the MS 170? Match the carburetor number stamped on the removed unit, then compare linkage, choke setup, primer routing, gasket stack, and fuel-inlet direction.

What should I check before replacing fuel-system parts? Photograph the old fuel-line routing, match line diameter and filter style, and compare primer bulb size before buying a kit.

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

Stihl MS170 Tune-Up Parts: What Actually FitsA tune-up overview for the Stihl MS170 chainsaw covering spark plug, air filter, fuel filter, carburetor, bar, and chain lookup steps.Stihl MS170 Won't Start After SittingA storage-related no-start checklist for Stihl MS170 chainsaws covering stale fuel, spark plug condition, fuel pickup, primer parts, and carburetor checks.How to Measure Chainsaw Chain Pitch, Gauge, and Drive LinksA model-identification guide for chainsaw chain replacement, explaining why bar length alone is not enough.Oregon Chain Number GuideHow to use Oregon chain numbers with pitch, gauge, drive-link count, bar length, and sprocket compatibility.

Spark Plug

OEM0000 400 7000Confidence: Medium · Source: Aftermarket catalog

Reviewed: 2026-05-20
Dimensions: 0.5mm plug gap

Brand	Part #
NGK	BPMR7A	Best for annual tune-upAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.
Champion	RCJ6Y	Best for annual tune-upAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Air Filter

OEM1130 124 0800Confidence: Medium · Source: Aftermarket catalog

Reviewed: 2026-05-20
Variant notes: Fits 017, 018, MS 170, and MS 180 family listings; verify cover style.

Brand	Part #
Stens	605-325	Best for annual tune-upAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Fuel Filter

OEM0000 350 3500Confidence: Low · Source: Aftermarket catalog

Reviewed: 2026-05-20
Variant notes: OEM reference only in current data; match pickup body style.

Brand	Part #
No aftermarket listing is published for this part yet. Use the OEM reference and verify with a dealer or service manual before ordering.

Carburetor

OEM1130 120 0603Confidence: Medium · Source: Aftermarket catalog

Reviewed: 2026-05-20
Variant notes: Match the carburetor number on the removed unit before replacing.
Exclusions: Do not use for other MS 170 variants unless carb number and linkage match.

Brand	Part #
Zama	C1Q-S257	Best if replacing fuel systemAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Recoil Starter

OEM1130 080 2103Confidence: Medium · Source: Aftermarket catalog

Reviewed: 2026-05-20
Variant notes: Verify starter housing style and pawl engagement.

Brand	Part #
Stens	150-220	Best overallAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Ignition Coil

OEM1130 400 1302Confidence: Medium · Source: Aftermarket catalog

Reviewed: 2026-05-20
Variant notes: Verify coil mounting and flywheel compatibility.

Brand	Part #
Stens	610-875	Best overallAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Primer Bulb

OEM4238 350 6201Confidence: Low · Source: Aftermarket catalog

Reviewed: 2026-05-20
Variant notes: Serial split noted in current data; compare old bulb and serial number.
Exclusions: Newer units may use 0000 350 6202 instead.

Brand	Part #
Zama	BG-00-4	Best if replacing fuel systemAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.
Hipa	G002-H	Best if replacing fuel systemAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Fuel Line Kit

OEM1130 358 7701Confidence: Medium · Source: Aftermarket catalog

Reviewed: 2026-05-20
Variant notes: Compare routing and grommet shape before cutting replacement line.

Brand	Part #
Stens	115-128	Best if replacing fuel systemAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Chain

OEMSpec-based fitmentConfidence: Low · Source: Inferred

Reviewed: 2026-05-20
Dimensions: 16 inch, 3/8 inch LP pitch, .043 inch gauge, 55 drive links
Variant notes: Verify bar stamp and drive-link count before ordering.

Brand	Part #
Oregon	R55	Best chain/bar comboAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Guide Bar