How to Troubleshoot Problems With Stihl Leaf Blowers

Updated November 21, 2016

Stihl outdoor power equipment is designed for both residential and commercial use. Stihl leaf blowers are often chosen by professionals as well as homeowners with larger lawns or properties. Minor operating issues with a Stihl blower that occur due to normal use can often be resolved with a few troubleshooting steps.

Pour one-half gallon of unleaded gasoline into a 1-gallon fuel container. Add 76.9ml. of 50-to-1 ratio oil to the gasoline in the container, and shake to mix. Add another half gallon of gasoline to the container and shake again. Fill the tank of the Stihl blower with the freshly mixed fuel.

Clean the air filter if the engine power of the Stihl blower is reduced. Open the housing cover, and remove the air filter. Tap the filter on a hard surface to loosen and remove dust, debris and dirt. Place the filter back into the filter housing, and secure the cover in place.

Disconnect the spark plug wire from the tip of the spark plug. Loosen and remove the spark plug with a spark plug wrench. Check the plug for fouling or carbon build-up. Install a suitable replacement spark plug if the old one is worn or damaged. Tighten the plug in place with the spark plug wrench, and attach the spark plug wire back to the plug tip.

Locate the carburettor adjustments screws on the side of the Stihl blower engine. Adjust the low-speed adjustment screw (L) counterclockwise with a flat-blade screwdriver one full turn if the engine stops when idling. Turn the idle-speed screw (LA) clockwise until the blower runs smooth. Turn the LA screw counterclockwise one-quarter turn with the screwdriver.

Adjust the Stihl blower carburettor if the engine is not accelerating properly. Turn the low-speed adjustment screw (L) counter clockwise with a blade screwdriver until the engine runs smooth at idle and during acceleration. Turn the idle-speed screw (LA) to the right to further smooth the engine.

Things You'll Need

  • 737gr. of 50-to-1 ratio engine oil
  • 1 gallon unleaded gasoline
  • Sparkplug wrench
  • Replacement sparkplug
  • Flat-blade screwdriver
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About the Author

Keith Dooley has a degree in outdoor education and sports management. He has worked as an assistant athletic director, head coach and assistant coach in various sports including football, softball and golf. Dooley has worked for various websites in the past, contributing instructional articles on a wide variety of topics.