Stihl 021 Workshop Manual


Stihl 021 Workshop Manual for the 021 chainsaw. View free page images online or download full PDF containing images, diagrams and accurate information. Print or save to any suitable device.
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Stihl 021 Service Workshop Manual Repair

Stihl 021 Service Workshop Manual for the Repair and service of 021 chainsaws. The PDF manual has diagrams and detailed information to troubleshoot and repair the chainsaw. View free page images online or download a full digital PDF that you can easily save, print or view on all devices.

Stihl 021 Workshop Manual Contents

Introduction, Specifications, Troubleshooting Attachments, Clutch, Engine, Ignition, Starter, Servicing, Controls, Fuel System, Special Tools.


This manual is designed to get the information you need quickly and easily.

Stihl 021 Chainsaw Specifications

First year of production: 1993

Displacement: 35.2 cc (2.15 cu. in.)

Fuel mix: 50:1 with Stihl 2 cycle oil

Standard Cylinder Diameter: 40 mm (1.42 in.)

Piston stroke: 28 mm (1.1 in.)

Cylinder construction: chrome-plated aluminum

Crankcase construction: cast magnesium

Walbro Carburetor:  WT-215 , WT-286A , WT-503A

Zama Carburetor:  C1Q-S11G

Spark Plugs: Bosch WSR6F Spark Plug, Champion RCJ6Y Spark Plug, NGK BPMR7A Spark Plug.

Fuel Mix Ratio: 50:1 with STIHL two-stroke engine oil, 25:1 with other brand name two-stroke, air-cooled engine oils.

Stihl 021 Carburetor Adjustments

Adjusting engine idle speed

A correction at the low-speed screw (L) usually necessitates a change in the setting of the idle speed adjusting screw (LA).
Note: Turn screws very slowly and carefully – even slight movements produce a noticeable change in engine running behavior.
Engine stops while idling

Check standard setting. Turn idle speed screw (LA) clockwise until the chain begins to run then turn it back one-quarter turn.

The chain runs while the engine is idling

Check standard setting. Turn the idle speed screw (LA) counterclockwise until the chain stops running – and then turn it about another quarter turn in the same direction.

Erratic idling behavior, poor acceleration even though low-speed screw in one turn open

Idle setting too lean-Turn the low-speed screw (L) counterclockwise until the engine runs and accelerates smoothly.

Important: If problems occur on the carburetor or the fuel supply system, always check and clean the tank vent.

The Stihl 021 is a lightweight saw that was first introduced in 1993. It is still being made today but in Stihl’s product branding that happened in 2002, it became the MS 210. It quickly became the favorite choice for any keen gardeners or smallholders.

Stihl 021 Service Workshop Manual PDF

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