WhichPartFits.com

Chainsaw

Stihl MS 500i

2-Stroke

The Stihl MS 500i is a 79.2cc 2-stroke professional chainsaw and the first production chainsaw from any manufacturer with direct electronic fuel injection — there is no carburetor to rebuild. The maintenance profile shifts accordingly: fuel filter cleanliness is critical (injectors are contamination-sensitive), but carburetor diaphragm and needle/seat replacement are eliminated entirely. The MS 500i accepts 20" to 32" guide bars and delivers consistent power delivery in any orientation and across altitude changes. Aimed at professional loggers who want peak performance without altitude-related richening.

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

Stihl MS 500i quick specs

Equipment
Chainsaw · 2-Stroke
Covered Parts
Spark Plug, Air Filter, Fuel Filter, Recoil Starter, Chain, Guide Bar
OEM References
0000 400 7011, 1144 140 4402, 0000 350 3518, 1144 080 2100
Model Family
MS 500i
Data Confidence
Not yet independently reviewed

Quick Fitment

  • Spark PlugOEM / Spec: 0000 400 7011NGK CMR6HSearch Amazon →Affiliate link
  • Air FilterOEM / Spec: 1144 140 4402OEM 1144 140 4402Search Amazon →Affiliate link
  • Fuel FilterOEM / Spec: 0000 350 3518OEM 0000 350 3518Search Amazon →Affiliate link
  • Recoil StarterOEM / Spec: 1144 080 2100OEM 1144 080 2100Search Amazon →Affiliate link
  • ChainOEM / Spec: 25", 3/8" pitch, .050" gauge, 84 drive linksOregon 72EXL084GSearch Amazon →Affiliate link
  • Guide BarOEM / Spec: 25", 3/8" pitch, .050" gaugeOregon 250VXLHD025Search Amazon →Affiliate link

As an Amazon Associate, WhichPartFits earns from qualifying purchases.

Tune-Up Kit

Common service bundle: spark plug, air filter, fuel filter.

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 500i, 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.
  • 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

Cuts slowly

Chain pitch/gauge, bar wear, drive links

Replacement Options

Best OEM equivalent

Start with OEM references 0000 400 7011, 1144 140 4402, 0000 350 3518, 1144 080 2100 and match the removed part before choosing a listing.

Named part options

Cross-check named parts such as NGK CMR6H (spark plug), Oregon 72EXL084G (chain), Oregon 250VXLHD025 (guide bar) against the OEM number, identity label, and dimensions.

Best for annual tune-up

Bundle spark plug, air filter, fuel filter when servicing the Stihl MS 500i at the start of the season.

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

Should I buy OEM or aftermarket parts for the Stihl MS 500i? 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.

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.

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

Spark Plug

OEM0000 400 7011
Dimensions
0.7mm gap
Variant notes
10mm thread — do not substitute BPMR7A (14mm thread)

Air Filter

OEM1144 140 4402
Variant notes
HD2 filter; also fits MS 651, MS 661 C-M
  • No named part listing is published for this part yet. Use the OEM reference and verify with a dealer or service manual before ordering.

Fuel Filter

OEM0000 350 3518
Variant notes
Orange in-tank pickup body fuel filter
  • No named part listing is published for this part yet. Use the OEM reference and verify with a dealer or service manual before ordering.

Recoil Starter

OEM1144 080 2100
  • No named part listing is published for this part yet. Use the OEM reference and verify with a dealer or service manual before ordering.

Chain

OEMSpec-based fitment
Dimensions
25", 3/8" pitch, .050" gauge, 84 drive links
Variant notes
Stock bar length; verify drive link count matches your bar

Guide Bar

OEMSpec-based fitment
Dimensions
25", 3/8" pitch, .050" gauge