Stihl Leaf Blower Troubleshooting

Written by eric blankenburg
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A Stihl leaf blower operates with a two-stroke engine. These engines are simple designs with few moving parts, requiring only three basic elements to start; air, spark and fuel combine at the right moment to provide combustion, which keeps the piston pumping and the crankcase moving. Find what piece is missing and search the area for the broken part.

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Troubleshooting Air Problems

Air problems often cause problems with power, dropping power and poor starts. The air, cleaned at the filter, must reach the carburettor to properly mix with the fuel. If the air can't suck in, the engine won't start and run properly. Clean the air filter, just above the carburettor near the fuel tank, after every use, especially if dust or dirt is prevalent in your working conditions. Clean off the entire back of the engine as well to keep any leaves from getting sucked into the engine. Check the muffler and spark arrester screen and clean them if you're still experiencing air problems.

Troubleshooting Spark Problems

The spark starts at the coil, gets tripped by the flywheel and sent up the terminal wire to the plug. Check the spark plug and replace it every 25 to 30 hours. If no spark is present, check the wiring at the "On/Off" switch, which can sometimes lead to a prematurely grounded circuit. Inspect every wire connection to make sure they are securely attached, especially near the ignition module. Leave most serious spark issues to a professional, however, due to the dangerous voltage involved.

Troubleshooting Gas Problems

The gas gets sucked up from the tank and into the carburettor, before it gets mixed with air and sent off to the cylinder. Dirty fuel tanks often cause hard starts, no starts, idling problems and acceleration problems. Check and clean the tank if dirt, leaves or other debris is floating in the fuel. Replace the fuel filter and fuel lines every 50 to 60 hours of operation. However, if you stored the Stihl leaf blower with gas still in the tank, replace the lines and filter immediately.

Troubleshooting Compression Problems

No compression generates a severe loss in power, running ability and may even cause starting problems. Test for compression with a compression gauge, much like a tire gauge, as it hooks directly to the cylinder and measures the amount of pressure inside your cylinder and crankcase. If air leaks are present, the pressure reading will drop off quickly. Compression problems generally require a skilled professional to locate the source of the air leak.

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