Stihl MS 661 Instruction Manual - Page 62
Troubleshooting Guide, 23.1 Chain saw, Chain saw
![]() |
View all Stihl MS 661 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 62 highlights
English 23 Troubleshooting Guide 23 Troubleshooting Guide 23.1 Chain saw Many performance issues can be resolved with a few simple steps. When troubleshooting, STIHL recommends that you start with the following measures: ► Clean the air filter, @ 21.3. ► Clean or replace the spark plug, @ 21.4. ► As appropriate for conditions, set the saw's "shutter" for winter or summer operation, @ 17.1 or @ 17.2. ► Return the carburetor to the standard setting, @ 17.5. ► Adjust the saw's idle speed, @ 23.2. ► If these measures do not resolve the issue, continue to the steps described below. Always shut off the engine before carrying out any inspection, cleaning or maintenance. Condition Possible Cause The engine does not start. There is insufficient fuel in the fuel tank. The engine is flooded. The carburetor is iced up. The engine idles erratically. The carburetor is iced up. The engine stops while The carburetor is iced up. idling. Acceleration is poor. The chain is tensioned too tight. Insufficient bar and chain oil. The chain does not rotate The chain brake is engaged. when throttle is opened. The chain is tensioned too tight. The guide bar sprocket is blocked. During sawing, the wood smokes or smells burnt. The chain is dull or improperly sharpened. Working technique is improper or the saw is being mis-used. Insufficient bar and chain oil. Remedy ► Refuel the chain saw, @ 13.2. ► Clear the combustion chamber, @ 23.3. ► Allow the engine to warm up gradually to a temperature of about 50 °F (10 °C). ► Allow the engine to warm up gradually to a temperature of about 50 °F (10 °C). ► Allow the engine to warm up gradually to a temperature of about 50 °F (10 °C). ► Properly tension the chain, @ 10.3. ► Increase oil feed rate, @ 11.3. ► Disengage the chain brake, @ 12.2. ► Properly tension the chain, @ 10.3. ► Spray the guide bar sprocket with resin remover. ► Properly sharpen the chain, @ 10.3. ► Obtain instruction on proper working technique. ► Have the chain lubrication mechanism checked by an authorized STIHL servicing dealer. 60 0458-758-8621-B
![](/manual_guide/products/stihl-ms-661-instruction-manual-038198c/62.png)