STIHL MS 261 Chainsaw Service Manual
This STIHL MS 261 service manual provides detailed descriptions of all repair and servicing procedures. Covers fuser assembly, paper path, and imaging procedures, plus diagnostic flowcharts
Stihl Models Covered & Key Technical Specifications
Models: STIHL MS 261, MS 261 C
Sub-models / Variants: Models with Quick Chain Tensioner, Models with ErgoStart, Models with Heating, Models with QuickStop Super
Model Years: 2010
Technical Data:
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Engine displacement: 50.2 cm3
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Bore: 44.7 mm
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Stroke: 32.0 mm
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Engine power (ISO 7293): 2.8 kW (3.8 bhp) at 9,500 rpm
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Idle speed: 2,800 rpm
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Max permissible engine speed: 14,000 rpm
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Clutch engagement speed: 3,600 rpm
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Spark plug (resistor type): NGK BPMR 7 A, BOSCH WSR6F
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Spark plug electrode gap: 0.5 mm
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Oil pump delivery rate (min): 4.5 (+/2.0) cm3/min at 10,000 rpm
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Oil pump delivery rate (max): 11.5 (+/3.0) cm3/min at 10,000 rpm
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Crankcase leakage test (gauge pressure): 0.5 bar
Stihl Manual Features & Content Preview
2010 STIHL MS 261 Factory Service Manual Overview
- Covers the 2010 STIHL MS 261 and MS 261 C chainsaws, outlining diagnostic and service procedures for both standard and specialty variants.
- Official OEM publication (© 2010 ANDREAS STIHL AG & Co. KG, revision May 2010, part number 1141-792-9101) spanning 335 pages.
- Contains 125 technical illustrations, over 35 exploded-view assembly diagrams, and 3 comprehensive troubleshooting flow charts for ignition and lubrication systems.
- Detailed torque-specification table provides precise values for over 50 assembly points across the engine and chassis.
- Delivered as an instant PDF download straight to your device immediately after purchase.
- Fully indexed structure allows for quick cross-referencing via your PDF reader's search tool. Optimized for standard US letter printing.
- Documents the specific diagnostic requirements for the professional-grade 50.2 cc engine platform and the integration of QuickStop Super braking systems.
System Coverage and Sub-Assemblies
This factory publication details the critical specifications required to understand and service the STIHL MS 261 power unit. Coverage spans the engine cylinder and crankshaft, clutch and brake systems, fuel supply, carburetor setup, and the rewind starter mechanism. It segments the chainsaw into manageable logical sections, documenting the exact layout and assembly order for components like the handlebar, AV system, control levers, and the dedicated heating system found on specialized models. The manual also highlights the required proprietary service tools, including the 5910 890 3101 assembly stand and various bearing installation sleeves.
Technical Specifications and Calibration
Expect precise factory data on engine performance parameters, ignition timing, and lubrication system flow rates. Before starting any diagnostic teardown, always ensure the power unit is fully depressurized, the spark plug disconnected, and the chain brake engaged to prevent accidental injury.
The factory engine idle speed is set at 2,800 rpm. You will find the ignition module air gap specified at 0.20 mm (+ 0.1/- 0.05 mm) within the data tables. Lubrication system oil pump flow is documented at 11.5 cm³/min at 10,000 rpm on the maximum setting. The guide lists all mandatory tightening torques, such as the strict 50 Nm specification for the carrier-to-crankshaft connection, ensuring professional-grade accuracy during reassembly.
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