WhichPartFits.com

Trimmer

Echo SRM-310

2-Stroke

The Echo SRM-310 is a 30.5cc 2-stroke straight-shaft trimmer and the most powerful model in Echo's commercial SRM lineup, built for the most demanding vegetation management — dense brush, saplings, and heavy perennial growth with rigid blade attachments. Under daily commercial production use, monthly fuel system service, gearhead repacking every 25–50 hours, and air filter maintenance after each shift in high-debris environments are routine. The SRM-310's displacement makes it a dedicated clearing tool rather than a standard grass trimmer; pairing it with the correct rigid blade for the vegetation type is important.

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

Echo SRM-310 quick specs

Equipment
Trimmer · 2-Stroke
Covered Parts
Spark Plug, Air Filter, Fuel Filter, Carburetor, Primer Bulb, Fuel Line Kit, Trimmer Head, Trimmer Line
OEM References
90023Y, A226001680, A369000100, 12520005960, 12318139130, V471001471, 99944200903
Model Family
SRM-280, SRM-310
Data Confidence
Not yet independently reviewed

Quick Fitment

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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 Echo SRM-310, 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.

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

Replacement Options

Best OEM equivalent

Start with OEM references 90023Y, A226001680, A369000100, 12520005960 and match the removed part before choosing a listing.

Named part options

Cross-check named parts such as Champion CJ8Y (spark plug), Stens 605-510 (air filter), Stens 610-009 (fuel filter) against the OEM number, identity label, and dimensions.

Best for annual tune-up

Bundle spark plug, air filter, fuel filter when servicing the Echo SRM-310 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 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

Should I buy OEM or aftermarket parts for the Echo SRM-310? 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 SRM-310? 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.

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

Spark Plug

OEM90023Y
Dimensions
0.6mm gap

Air Filter

OEMA226001680
Variant notes
Also fits SRM-280

Fuel Filter

OEMA369000100
Variant notes
In-tank pickup filter; fits most Echo chainsaws and trimmers

Carburetor

OEM12520005960
Variant notes
Zama C1U-K84; 30.5cc engine

Primer Bulb

OEM12318139130

Fuel Line Kit

OEMV471001471
Variant notes
Includes fuel pickup line and return line

Trimmer Head

OEM99944200903
Variant notes
Speed-Feed 400; bump-feed

Trimmer Line

OEMSpec-based fitment
Dimensions
.105" diameter, round