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Chainsaw

Husqvarna 120

2-Stroke

The Husqvarna 120 is a 38.2cc 2-stroke chainsaw positioned as an occasional-use homeowner model for light property tasks — limbing, small firewood, and storm cleanup — accepting 13" to 15" guide bars. It runs a Zama carburetor. Husqvarna's SmartStart system reduces initial pull resistance. The 120 shares service part families with the 130 series for good parts availability. Routine maintenance items are the spark plug (NGK BPMR7A or Champion RCJ6Y), air filter, primer bulb, and fuel lines. Draining the fuel system before storage prevents the most common no-start condition on low-use homeowner saws.

See a wrong fitment? Report a correction.

What this page covers

This page covers the Husqvarna 120 2-Stroke chainsaw.

Recorded annual maintenance parts: Spark Plug, Air Filter, Fuel Filter, Primer Bulb, Fuel Line Kit.

Evidence: explicit provenance is recorded (Aftermarket-confirmed; reviewed 2026-05-21).

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NGK BPMR7A; fits 120 Mark II

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
503235108
Specification / dimensions
0.5mm gap
Evidence status
Medium confidence · Aftermarket catalog · 2026-05-21
Variant / exclusion warning
NGK BPMR7A; fits 120 Mark II

Air intake

Air Filter

OEM number
545061801
Specification / dimensions
Not recorded
Evidence status
Medium confidence · Aftermarket catalog · 2026-05-21
Variant / exclusion warning
Also fits 120 Mark II, 230, 235, 236, 240

Fuel delivery

Fuel Filter

OEM number
591375401
Specification / dimensions
Not recorded
Evidence status
Medium confidence · Aftermarket catalog · 2026-05-21
Variant / exclusion warning
In-tank pickup filter

Primer Bulb

OEM number
545008030
Specification / dimensions
Not recorded
Evidence status
Medium confidence · Aftermarket catalog · 2026-05-21
Variant / exclusion warning
Purge and line assembly; also fits 120 Mark II, 125B, 235, 236, 240

Fuel Line Kit

OEM number
580727101
Specification / dimensions
Not recorded
Evidence status
Medium confidence · Aftermarket catalog · 2026-05-21
Variant / exclusion warning
Fuel hose kit LP100 5.3 O.D.; includes main fuel line

Husqvarna 120 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
503235108, 545061801, 591375401, 586936202, 545008028, 575803501, 545008030, 580727101
Model Family
120, 130, 135
Last Reviewed
2026-05-21
Data Confidence
Aftermarket-confirmed
Sources Consulted
Husqvarna 120 parts references, Aftermarket catalog cross-references, Retailer fitment listings
ℹ See also: 130, 135 — verify each model and part independently; family membership does not establish fitment.

Quick Fitment

Part TypeOEM / SpecCommon OptionConfidence
Spark Plug503235108NGK BPMR7AMedium · 2026-05-21
Air Filter545061801Stens 605-580Medium · 2026-05-21
Fuel Filter591375401Stens 610-034Medium · 2026-05-21
Carburetor586936202Zama C1T-W33CMedium · 2026-05-21
Primer Bulb545008030Zama BG-00-4Medium · 2026-05-21
Recoil Starter545008028OEM 545008028Low · 2026-05-21
Ignition Coil575803501OEM 575803501Low · 2026-05-21
Fuel Line Kit580727101Stens 115-530Medium · 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 Husqvarna 120, 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 503235108, 545061801, 591375401, 586936202 and match the removed part before choosing a listing.

Common aftermarket option

Cross-check aftermarket listings such as NGK BPMR7A (spark plug), Stens 605-580 (air filter), Stens 610-034 (fuel filter) against the OEM number and dimensions.

Best chain/bar combo

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

FAQ

Does this fit 130 or 135? 130, 135 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 120? 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

Husqvarna 120 Starts Then Dies: Fuel and Air ChecksA troubleshooting guide for Husqvarna 120 chainsaws that start briefly and stall, with links to filters, fuel line kits, carburetor, and spark plug references.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

OEM503235108Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Dimensions
0.5mm gap
Variant notes
NGK BPMR7A; fits 120 Mark II
BrandPart #
NGKBPMR7A
Search AmazonAmazonAffiliate link

Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

ChampionRCJ6Y
Search AmazonAmazonAffiliate link

Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Air Filter

OEM545061801Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
Also fits 120 Mark II, 230, 235, 236, 240
BrandPart #
Stens605-580
Search AmazonAmazonAffiliate link

Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Fuel Filter

OEM591375401Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
In-tank pickup filter
BrandPart #
Stens610-034
Search AmazonAmazonAffiliate link

Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Carburetor

OEM586936202Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
14mm air bore; also fits 120 Mark II, 235, 236, 240 (C1T-W33C type)
BrandPart #
ZamaC1T-W33C
Search AmazonAmazonAffiliate link

Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Recoil Starter

OEM545008028Confidence: Low · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
Standard starter kit; also fits 120 Mark II, 235, 236, 240
BrandPart #
No aftermarket listing is published for this part yet. Use the OEM reference and verify with a dealer or service manual before ordering.

Ignition Coil

OEM575803501Confidence: Low · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
Also fits 120 Mark II, 136, 141, 230, 235, 236, 240
BrandPart #
No aftermarket listing is published for this part yet. Use the OEM reference and verify with a dealer or service manual before ordering.

Primer Bulb

OEM545008030Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
Purge and line assembly; also fits 120 Mark II, 125B, 235, 236, 240
BrandPart #
ZamaBG-00-4
Search AmazonAmazonAffiliate link

Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Fuel Line Kit

OEM580727101Confidence: Medium · Source: Aftermarket catalog
Reviewed
2026-05-21
Variant notes
Fuel hose kit LP100 5.3 O.D.; includes main fuel line
BrandPart #
Stens115-530
Search AmazonAmazonAffiliate 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
2026-05-21
Dimensions
16 inch, 3/8 inch LP pitch, .050 inch gauge, 56 drive links
Variant notes
Stock bar length; verify drive link count matches your bar
BrandPart #
Oregon91PX056G
Search AmazonAmazonAffiliate link

Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

OregonS56
Search AmazonAmazonAffiliate link

Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Guide Bar

OEMSpec-based fitmentConfidence: Low · Source: Inferred
Reviewed
2026-05-21
Dimensions
16 inch, 3/8 inch LP pitch, .050 inch gauge, 56 drive links
Variant notes
Spec-based fitment; confirm dimensions on the existing bar or part.
BrandPart #
Oregon160SDEA041
Search AmazonAmazonAffiliate link

Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.