STIHL MS 341 / MS 361 (1135 Series) Chainsaw Service Manual, 2003–2012

This 164-page PDF set covers STIHL 1135-series MS 341, MS 361, and MS 361 C chainsaws. It combines the 110-page, 2004-05 factory service manual with a 24-page MS 341 Illustrated Parts List and a 30-page MS 361/MS 361 C Illustrated Parts List. The service manual states that it is intended exclusively for properly equipped repair shops, and its tooling, test-equipment, and procedural depth make it suited to trained technicians with chainsaw repair experience.

• Engine and crankcase repair: Documents pressure and vacuum leakage testing, oil-seal replacement without complete crankcase disassembly, cylinder and piston removal and installation, piston-ring inspection, and crankcase/crankshaft separation and assembly. Component-specific torque tables and service limits support the covered work.
• Clutch, chain drive, and braking systems: Covers the clutch drum, chain sprocket, clutch, chain catcher, bar studs, and chain tensioner. Separate procedures address chain-brake service with and without QuickStop Super, including brake-cable play adjustment and the coasting-brake operational check.
• Fuel, air, and chain lubrication: Details the MS 341 HD-35A and MS 361-family HD-34A carburetors, including leakage testing, metering diaphragm and inlet needle service, fixed jet, pump diaphragm, accelerator pump, limiter caps, and basic adjustment. Tank ventilation, fuel hose, pickup body, oil tank valve, and oil-pump repair are also covered.
• Ignition and starting equipment: Includes ignition-module testing with ZAT 3 or ZAT 4, module-to-flywheel air-gap setup, flywheel removal, ignition-lead and wiring-harness checks, plus fault-isolation charts. Rewind-starter coverage extends through pawls, rope rotor, starter rope and grip, guide bushing, spring replacement, and spring tensioning.
• Heated and non-heated configurations: Provides dedicated diagnosis for carburetor heating and handle heating, with thermostat, heater-element, switch, generator, connector, and resistance checks. Wiring-harness routing is broken out for standard saws, handle-heated saws, and machines with both handle and carburetor heating.
• Exploded component identification: Named parts views include Crankcase, Cylinder, Muffler, Oil Pump, Clutch, Chain Brake, Ignition System, Wiring Harness, and Heating. Each view is paired with reference numbers, quantities, descriptions, and STIHL item codes.

Model and Variant Details

The specifications show why MS 341 and MS 361 procedures can share one manual while still requiring model-specific settings. Both use a 59.0 cc engine with a 47 mm bore and 34 mm stroke, but the MS 341 is rated at 3.1 kW (4.1 bhp) and the MS 361 at 3.4 kW (4.6 bhp); their maximum permissible engine speeds also differ. The MS 361 parts list identifies four configurations: MS 361, MS 361 C, MS 361 W, and MS 361 WVH. Its callouts distinguish QuickStop Super parts, handle-heated W/WVH components, the additional carburetor-heating hardware on the WVH, and region-specific cylinder, muffler, and spark-arresting-screen applications for the USA, Canada, Australia, and New Zealand.

Diagnostic References and Special Tools

Troubleshooting tables cover the engine, carburetor, ignition, rewind starter, chain lubrication, clutch, chain drive, chain brake, and chain tensioner. The heating chapters add carburetor-heater and generator/handle-heater flowcharts, connector locations, and component test-value tables. Electrical coverage consists of these test charts and harness-routing views; this set is not a separate full-system wiring-diagram manual.

The special-tool section supplies part numbers and applications for equipment such as carburetor/crankcase tester 1106 850 2905, vacuum pump 0000 850 3501, crankshaft service tools ZS 5910 007 2200 / 5910 007 2220 and AS 5910 007 2205, flywheel puller 1135 890 4500, and ignition testers ZAT 4 5910 850 4503 and ZAT 3 5910 850 4520.

Shop Cautions and Publication Scope

The chain-brake section warns that driving the spring anchor pin in the wrong direction can damage the formed bead in the crankcase and impair brake operation. The rewind-starter section also cautions that over-tensioning can break the spring. For parts ordering and engineering changes made after publication, the manual directs technicians to the latest applicable STIHL parts information and Technical Information bulletins.

Powered testing involves a moving chain, high ignition voltage, and flammable gasoline. Follow the saw's instruction-manual precautions, perform fuel work outdoors away from ignition sources, and confirm correct chain-brake operation before returning the machine to service.