Stihl MS201T Parts Manual

The Stihl MS201T is a professional-grade top-handle chainsaw designed for arborists and tree care professionals. This parts manual provides detailed information on the components, assembly, maintenance, and replacement parts for the MS201T model. Below are key sections covering identification, major assemblies, engine components, fuel system, ignition system, cutting attachments, and ordering information.

1. Identification and Specifications 2. Major Assemblies 3. Engine Components 4. Fuel System Parts 5. Ignition System 6. Cutting Attachment Parts 7. Air Filter and Cooling System 8. Starter Assembly 9. Maintenance and Care 10. Parts Ordering Information 11. Troubleshooting Parts Issues

Identification and Specifications

Key identification: Model number MS201T, serial number location on crankcase. Engine type: 2-stroke, single cylinder.

Specification	Description
Displacement	35.2 cc (2.15 cu. in.)
Power Output	2.0 kW (2.7 bhp)
Fuel Tank Capacity	0.25 L (0.066 US gal)
Oil Tank Capacity	0.20 L (0.053 US gal)
Weight (powerhead)	3.9 kg (8.6 lbs)
Guide Bar Lengths	30-40 cm (12-16 inches)
Chain Pitch	1/4" P or 3/8" PM
Ignition System	Electronic, capacitor discharge
Spark Plug	Bosch WSR6F or equivalent
Fuel/Oil Ratio	50:1 (STIHL HP Ultra oil)

Major Assemblies

Complete unit breakdown: Crankcase assembly, cylinder/piston group, clutch assembly, fuel tank, oil tank, handle assembly.

Crankcase Assembly: Includes crankcase halves, crankshaft, bearings, seals.
Cylinder/Piston Group: Cylinder, piston, rings, wrist pin, circlips.
Clutch Assembly: Clutch drum, shoes, springs, retaining nut.
Fuel Tank Assembly: Tank, cap, fuel line, filter, carburetor mount.
Oil Tank Assembly: Tank, cap, oil pump, delivery line.
Handle Assembly: Top handle, antivibration elements, throttle trigger, lockout.

WARNING! Disconnect spark plug before disassembly. Use proper tools to avoid damage.

Engine Components

Detailed parts list for engine section.

Crankshaft: Part # 1140 040 2001
Main Bearings: Ball bearings (front/rear).
Crank Seals: Oil seals for crankshaft.
Cylinder: Part # 1140 020 2001 with decompression valve.
Piston: Part # 1140 030 2001 with two piston rings.
Connecting Rod: Integrated with crankshaft.
Crankcase: Two halves, Part # 1140 010 2001 (set).

CAUTION! Ensure clean work area. Match parts to exact model number.

Fuel System Parts

Carburetor: Zama C1Q-S267 (Part # 1140 120 2001).
Fuel Filter: In-tank filter (Part # 0000 350 3501).
Fuel Line: 3.5mm ID line (Part # 0000 350 2900).
Fuel Tank Cap: Venting cap (Part # 0000 350 4301).
Impulse Line: Connects carburetor to crankcase.
Air Filter: Two-stage foam/fleece (Part # 0000 350 4701).
Throttle Linkage: Rod and springs for carburetor control.

Ignition System

Components: Ignition module, spark plug, stop switch, wiring harness.

Ignition Module: Part # 1140 400 2001 (includes coil and electronics).

Spark Plug: Bosch WSR6F (Part # 0000 350 2905) gap 0.5mm (0.020"). Stop Switch: Rocker switch on handle (Part # 0000 350 4305). Wiring: Harness connecting switch to module. Flywheel: Magneto flywheel with fins (Part # 1140 410 2001).

Cutting Attachment Parts

Guide bar, chain, sprocket, clutch cover, chain tensioner.

Guide Bar: STIHL Rollomatic E (Part # 3005 000 2012 for 12").
Chain: 1/4" P Picco Micro 3 (PM3) (Part # 3613 005 0055).
Sprocket: Rim sprocket 1/4" P (Part # 0000 350 4307).
Clutch Cover: With chain brake (Part # 1140 790 2001).
Chain Tensioner: Screw adjustment via side cover.
Bar Nuts: M8 nuts for securing bar.

Tip: Always match chain pitch and gauge to bar specifications.

Air Filter and Cooling System

Air filter assembly: Pre-filter (fleece) and main filter (foam). Cooling: Flywheel fins, cylinder fins, deflectors.

Air Filter Cover: Part # 0000 350 4303.
Pre-Filter: Part # 0000 350 4702 (fleece).
Main Filter: Part # 0000 350 4701 (foam).
Flywheel Fan: Integrated with flywheel.
Cylinder Fins: Keep clean for proper cooling.
Deflector: Directs air flow (Part # 1140 141 2001).

WARNING! Never operate without air filter. Clean regularly.

Starter Assembly

Recoil starter: Housing, pulley, spring, rope, handle.

Maintenance and Care

Regular maintenance parts: Spark plug, air filter, fuel filter, chain, bar, sprocket.

CAUTION! Use only genuine STIHL parts. Follow service intervals.

Parts Ordering Information

Order from authorized STIHL dealers. Provide model number (MS201T) and serial number. Exploded diagrams available in STIHL IPL (Illustrated Parts List). For support, visit www.stihlusa.com or contact 1-800-467-8445.

Troubleshooting Parts Issues

Symptom	Possible Part Issue	Corrective Action
Engine won't start	Spark plug, fuel filter	Replace spark plug; check/replace fuel filter.
Loss of power	Clogged air filter, carburetor	Clean/replace air filter; inspect carburetor diaphragms.
Oil not feeding	Oil pump, delivery line	Check oil pump drive; replace oil line if cracked.
Chain won't turn	Clutch, sprocket, bar	Inspect clutch shoes/springs; replace worn sprocket/bar.
Excessive vibration	AV mounts, crankshaft	Replace antivibration elements; check crankshaft balance.

Note: Refer to service manual for detailed repair procedures.

Service: 1-800-467-8445; www.stihlusa.com