stihl ms 260 parts manual

The STIHL MS 260 is a professional-grade chainsaw known for its power, reliability, and ease of maintenance. This parts manual provides detailed diagrams, part numbers, and ordering information for all components of the MS 260 chainsaw, including the engine assembly, cutting attachment, fuel system, ignition system, and housing. Below are key sections for identification, engine parts, fuel system, cutting equipment, and ordering.

1. Identification & Specifications 2. Engine Assembly & Crankcase 3. Fuel System & Carburetor 4. Ignition System & Electronics 5. Cutting Attachment & Guide Bar 6. Housing & External Components 7. Maintenance & Replacement Intervals 8. Exploded Views & Diagrams 9. Ordering Parts & Support 10. Safety & Warnings 11. Troubleshooting Parts Issues

Identification & Specifications

Key identifiers: Model MS 260, Engine displacement, Serial number location, Power output.

Feature	Description
Model	STIHL MS 260
Engine Type	2-stroke, single cylinder
Displacement	50.2 cm³ (3.06 cu. in.)
Power Output	2.6 kW (3.5 bhp)
Fuel Tank Capacity	0.5 L (16.9 fl. oz.)
Oil Tank Capacity	0.26 L (8.8 fl. oz.)
Guide Bar Lengths	40 cm (16"), 45 cm (18")
Weight (powerhead)	5.2 kg (11.5 lbs)
Ignition System	Electronic, capacitor discharge
Serial Number Location	On crankcase housing

Engine Assembly & Crankcase

Components of the engine block and crankcase assembly.

Cylinder and Piston: Includes cylinder, piston, rings, wrist pin, and circlips.
Crankshaft and Bearings: Main crankshaft, connecting rod, ball bearings, and seals.
Crankcase: Upper and lower halves, gaskets, and mounting screws.
Muffler and Spark Arrestor: Exhaust cover, spark arrestor screen, and gasket.

WARNING! Engine components are precision parts; handle with care to avoid damage. Use proper tools for disassembly.

Fuel System & Carburetor

Parts for fuel delivery and mixture control.

Fuel Tank: Tank assembly, cap, vent, and fuel line.
Carburetor: Complete carburetor assembly, diaphragm kit, gaskets, adjustment screws (H, L, LA).
Fuel Filter: In-tank filter and pickup line.
Impulse Line: Connects crankcase to carburetor for fuel pump operation.

CAUTION! Ensure fuel system is clean and free of debris before assembly to prevent engine damage.

Ignition System & Electronics

Ignition Module: Electronic control unit (ECU) with spark advance.
Spark Plug: Bosch WSR 6 F or equivalent, electrode gap 0.5 mm (0.020").
Stop Switch: On/off switch assembly and wiring harness.
Wiring: Lead to spark plug, ground wire, connector plugs.
Flywheel: Magneto flywheel with keyway and fan blades.
Coil: Ignition coil mounted under flywheel.

Cutting Attachment & Guide Bar

Components for the cutting system.

Guide Bar: Roller nose bar (40cm/16", 45cm/18"), bar rails, and oil holes.

Chain: Saw chain (pitch 3/8", gauge 0.050", drive links vary by bar length).

Sprocket: Rim sprocket or spur sprocket, clutch drum, and bearing.

Clutch: Centrifugal clutch assembly, springs, and shoes.

Chain Tensioner: Adjuster screw, pinion, and side cover nuts.

Housing & External Components

External parts and ergonomic components.

Front Handle: Handle assembly, anti-vibration elements, and mounting bolts.
Rear Handle: Handle with trigger, throttle lockout, and master control lever.
Top Cover: Air filter cover, decompression valve (if equipped), and fasteners.
Side Covers: Clutch cover, chain brake assembly (if equipped), and hand guard.

Tip: Inspect anti-vibration mounts regularly for wear and replace if cracked.

Maintenance & Replacement Intervals

Recommended part replacement schedule for optimal performance.

Air Filter: Clean every 10 hours; replace when damaged or heavily clogged.
Spark Plug: Replace every 50 operating hours or annually.
Fuel Filter: Replace every 3 months or 20 hours of operation.
Chain and Bar: Inspect daily; dress bar rails monthly; replace chain when cutters are worn.
Clutch and Sprocket: Inspect every 100 hours; replace if worn or damaged.
Anti-vibration elements: Check every 200 hours; replace if deteriorated.

WARNING! Use only genuine STIHL parts to maintain performance and safety certifications.

Exploded Views & Diagrams

Refer to numbered diagrams for part identification and assembly order. Diagrams include: Engine Group (1000), Fuel System Group (2000), Ignition Group (3000), Cutting Attachment Group (4000), Housing Group (5000).

Ordering Parts & Support

Always order parts using the correct part number from the diagrams. Contact authorized STIHL dealers for parts and technical support.

CAUTION! Non-genuine parts may void warranty and compromise safety.

Safety & Warnings

Always wear appropriate PPE. Disconnect spark plug before servicing. Use proper tools. Follow torque specifications. Dispose of used parts and fluids according to local regulations.

Troubleshooting Parts Issues

Symptom	Possible Part Failure	Corrective Action
Engine won't start	Fouled spark plug, clogged fuel filter	Replace spark plug; install new fuel filter.
Loss of power	Worn piston/cylinder, clogged air filter	Inspect cylinder; replace air filter.
Chain won't turn	Worn clutch/sprocket, seized bearing	Replace clutch assembly and sprocket bearing.
Excessive vibration	Failed anti-vibration mounts, loose components	Replace mounts; tighten all fasteners.
Oil leakage	Damaged crankcase seals, cracked oil line	Replace seals and oil delivery hose.

Dealer Support: Contact authorized STIHL dealer for complex repairs.

STIHL Support: www.stihlusa.com; 1-800-467-8445